Shrub or spreading low shrub, to 1 m tall (Fig. 12D). Branches erect, or ascending; old stems dark brown (mostly), or grey; youngest branchlets brown, or red-brown, or green; internodes (1–)2–6(–7.5) mm long; leaf decurrencies evident; leaf-base scars prominent; stem pubescence bifarious, eglandular. Leaf bud about as long as mature leaves with leaves of a pair separating when mature; sinus broad and acute (Fig. 12E). Leaves free at base, erecto-patent to patent; lamina obovate or oblanceolate or elliptic (Fig. 12F, 13), coriaceous, concave, (6.4–)7–15.5(–19.6) mm long, (3.5–)5.3– 6.9(–7.9) mm wide; apex obtuse to acute; base cuneate; evident venation in fresh leaves consisting of midrib only; midrib thickened beneath and depressed to grooved above; margin usually slightly thickened, rounded (or often ± squarish), minutely papillate and sometimes glandular-ciliate (with clusters of short glandular hairs at bases of marginal teeth), entire or crenate (may vary on one plant); upper surface green, slightly glossy or dull, with many or with few or without evident stomata, hairy along midrib (hairs 0.075–0.175 mm long, Fig. 14A,B); lower surface glaucous or glaucescent or light green, dull, with many stomata, glabrous. Petiole 1–2.5 mm long, hairy above (along midrib). Inflorescences (Fig. 15B) with 4–10(–16) flowers, lateral, racemose and unbranched (mostly) or sometimes racemose and compound with (1–)2 branches at base, 0.9–3.1 cm long, longer than (mostly) or about equal to subtending leaves, flowers opening in acropetal sequence; peduncle (0.1–)0.4–0.65 cm long, pubescent with a mixture of eglandular and glandular hairs (glandular hairs not always obvious); rachis (0.4–)1–1.5(–2.1) cm long, pubescent with a mixture of eglandular and glandular hairs; bracts opposite and decussate, usually free or connate (only sometimes, and then only connected by a very narrow ridge), subacute or acute or acuminate, ciliolate with both glandular and eglandular hairs and sometimes with eglandular and minute twin-headed glandular hairs inside, lanceolate or deltoid; pedicels shorter or much shorter than bracts or absent, pubescent with both eglandular and glandular hairs, suberect or erectopatent at anthesis, suberect or erecto-patent at fruiting, 0.5–1.5 mm long. Flowers on individual plants either hermaphrodite or female. Calyx 2– 3 mm long, 4-lobed, divisions subequally deep; lobes lanceolate to elliptic, obtuse or subacute, with mixed glandular and eglandular cilia, margins narrowly membranous. Corolla white at anthesis, white after pollination; tube glabrous, 1.8–3 mm long, 2.2–2.5 mm wide, broadly funnelform and contracted at base, more or less equalling calyx; tube of female flowers 1.4–1.6 mm long, c. 1.5–1.8 mm wide, contracted at base, shorter than or equalling calyx (Fig. 16C); lobes longer than corolla tube, glabrous; posterior lobe ovate, obtuse; lateral lobes elliptic, obtuse; anterior lobe elliptic, obtuse; corolla throat white. Stamen filaments white, diverging after anthesis, straight at apex in bud, 2.5–6.5 mm long (lower value represents staminodes only); anthers obtuse or apiculate, magenta, c. 2–2.2 mm long; sterile anthers c. 0.7–1.1 mm long. Nectarial disc glabrous. Ovary ovoid, glabrous, 1.5–1.7 mm long; ovules 7–18 per locule (in hermaphrodite plants), marginal in one layer on a flattened placenta; style 5–7 mm long, glabrous, white; stigma subcapitate or capitate, white or yellow or green at anthesis. Capsules subacute or obtuse, pale brown, 3.2–4 mm long, (2.2–)2.5–3.2 mm wide, glabrous, loculicidal split extending ¼–½ way to base.

H. cockayneana et H. cryptomorpha affinis; ab ambobus numero chromosomatum (2n = 80) et compositione flavonoideorum (ut indice 1) differt; a H. cockayneana pubescentibus foliorum costae in pagina supra crassis (pilis 0.075–0.175 mm longis), foliis oblanceolatis a margine crenulatis interdum differt; a H. cryptomorpha 7–18 ovulis in ovariis plantarum hermaphroditarum instructis, foliis longissimis (11.9–)14.0–22.0(–25.4) mm longis differt.

Shrub or rounded shrub, to 1.2 m tall (Fig. 12A). Branches erect; old stems light to very dark brown, or red-brown (chocolate); youngest branchlets brown (usually), or green; internodes 1– 8(–10) mm long; leaf decurrencies evident; leaf-base scars prominent; stem pubescence bifarious (sometimes sparsely), eglandular. Leaf bud about as long as mature leaves with leaves of a pair separating when mature; sinus broad and acute (Fig. 12B). Leaves decussate, erecto-patent to patent; lamina (Fig. 12C, 13) oblanceolate or lanceolate or elliptic (less commonly), fleshy or slightly thin, (7–)13–28(– 33) mm long, (3–)4–8(–9) mm wide; apex acute or subacute; base cuneate; evident venation in fresh leaves consisting of midrib only; midrib thickened beneath and depressed to grooved above; margin not thickened, rounded (or squarish), minutely papillate, entire (almost always) or crenate (minute teeth only sometimes present); upper surface green, dull or slightly glossy, with many or with few (usually) or without evident stomata, hairy along midrib (Fig. 14C); lower surface light green or glaucous or glaucescent, dull, with many stomata. Petiole 1–4(– 6) mm long, hairy above (along midrib). Inflorescences (Fig. 15A) with 5–17 flowers, lateral, racemose and unbranched (almost always) or racemose and compound with (1–)2 branches at base (very rarely, and with lateral branches short and not well developed), 1.2–3.7 cm long, about equal to or longer than subtending leaves, flowers opening in acropetal sequence; peduncle (0.2–)0.3–0.6(–1.3) cm long, pubescent with a mixture of eglandular and glandular hairs; rachis (0.8–)1.2–2.6(–3.1) cm long, pubescent with a mixture of eglandular and glandular hairs; bracts almost always opposite and decussate, free (usually) or connate (sometimes very shortly, especially near base of inflorescence), acute or subacute or obtuse (infrequently), ciliolate with both glandular and eglandular hairs and sometimes with eglandular and minute twin-headed glandular hairs inside, lanceolate or ovate or deltoid; pedicels shorter or much shorter than bracts or absent (can vary on one plant), pubescent with both eglandular and glandular hairs, suberect at anthesis, suberect to erecto-patent at fruiting, 0.5–3(–5) mm long. Flowers on individual plants either hermaphrodite or female. Calyx 2.4–3(–3.5) mm long, 3–4-lobed, divisions subequally deep (mostly) or with anterior lobes united to 1⁄3 to whole (or almost whole) way to apex; lobes lanceolate to elliptic, subacute or obtuse or acute, with mixed glandular and eglandular cilia, margins narrowly membranous. Corolla white at anthesis, white after pollination; tube glabrous, 1.5–3 mm long, 2–3 mm wide, shortly cylindric, equalling or slightly longer than calyx (Fig. 16A); lobes longer than corolla tube, glabrous; posterior lobe ovate to elliptic, obtuse, patent, with margin and apex flat; lateral lobes ovate to elliptic, obtuse, suberect to recurved, with margin and apex flat; anterior lobe ovate to elliptic, obtuse, patent to recurved, with margin and apex flat; corolla throat white. Stamen filaments white, diverging after anthesis, straight at apex in bud, 3.5–5.5 mm long; anthers obtuse or shortly apiculate, dark pink or purplish mauve, 1.9–2.4 mm long. Nectarial disc glabrous. Ovary ovoid, glabrous or sparsely eglandular hairy, 1.5–2.1 mm long; ovules 15–33 per locule (in hermaphrodite plants), marginal in 1½–2 layers on a flattened placenta; style 3–6.5 mm long, c. 0.15–0.25 mm thick, glabrous or with sparse multicellular hairs (especially toward base), white; stigma subcapitate, white or yellow or green at anthesis, 0.25–0.35 mm wide. Capsules latiseptate, obtuse or subacute, pale to dark brown, 3–4 mm long, 2.4–2.8 mm wide, glabrous or with sparse eglandular, multicellular hairs, loculicidal split extending ¼ –½ way to base.

H. cockayneana et H. crenulata affinis; ab ambobus numero chromosomatum (2n = 40) et compositione flavonoideorum (ut indice 1) differt; a H. cockayneana foliis oblanceolatis (8.0–)16.0– 30.0(–36.0) mm longis, (2.66–)2.82–3.81(–4.34) plo longioribus quam latioribus, distantia e basi ad partem latissimam (7.6–)9.5–20.0(–22.4) mm, foliis longissimis (19.0–)21.0–30.0(–36.0) mm longis differt; a H. crenulata numero ovulorum (15–33 in quoque loculo plantarum hermaphroditarum), foliis longissimis (19.0–)21.0–30.0(–35.1) mm longis differt.

Leaves narrowly elliptic (usually), or elliptic or oblanceolate, concave above, (7.7–)12.5–20(–31.4) mm long, (2.1–)3.4–5.6(–7.4) mm wide, ratio of leaf length to width (2.5–)2.8– 3.3(–3.5). Pedicels (0.1–)0.3–0.8 mm long.

Leaves elliptic or broadly elliptic, "m"-shaped in transverse section (9.4–) 13.5–25(–28.2) mm long, (3.2–)5.0–7.5(–8.7) mm wide, ratio of leaf length to width (2.5–)2.8–3.3 (–3.5). Pedicels (0.3–)0.4–2.0 mm long.

A varietate typica foliis in sectione transversali "m"-formatis, saepe latioribus et late elliptic magis ((9.4–)13.5–25(–28.2) mm longis, (3.2–)5.0–7.5(–8.7) mm latis), et (2.5–)2.8–3.3(– 3.5)-plo longioribus quam latioribus.

Shrub, to 0.7 m tall (Fig. 7G). Branches erect, or ascending; old stems black, or grey (producing thick cork with age); youngest branchlets green to brown; internodes 2–5(–8) mm long; leaf decurrencies evident and extended for length of internode; leaf-base scars prominent; stem pubescence bifarious to uniform, with a mixture of glandular and eglandular hairs. Leaf bud about as long as mature leaves with leaves of a pair separating when mature; sinus narrow and acute to broad and acute (Fig. 7H). Leaves decussate to subdistichous, erecto-patent to patent; lamina linear-elliptic or elliptic to oblanceolate (narrowly), subcoriaceous, m-shaped in transverse section (Fig. 6), (14–)20– 44(–55) mm long, (4–)6–11(–16) mm wide; apex plicate and subacute or acute or subapiculate; base cuneate; evident venation in fresh leaves usually consisting of midrib only; midrib thickened beneath and strongly depressed to grooved above; margin cartilaginous and thickened, rounded, minutely papillate; upper surface green to dark green, glossy (Fig. 7I), without evident stomata, hairy along midrib; lower surface glaucous, dull (Fig. 7I), densely covered with stomata, glabrous. Petiole 2– 4(–5) mm long, hairy above. Juvenile and reversion leaves incised. Inflorescences with (7–)15–30(–40) flowers, lateral, racemose and compound with (1–)2 branches at base (Fig. 9B), simple inflorescences rarely also present, (1.5–)2–3.5(–4.6) cm long, ranging from shorter than to about equal to subtending leaves, flowers opening in acropetal or basipetal sequence; peduncle (0.5–)0.8–1.5(–2.5) cm long, pubescent with a mixture of eglandular and glandular hairs; rachis 1–1.8(–2.5) cm long, pubescent with a mixture of eglandular and glandular hairs; bracts usually opposite and decussate below, becoming alternate above, free, acute to acuminate or rarely obtuse, sparsely ciliolate with both glandular and eglandular hairs, lanceolate to linear or rarely ovate; pedicels equal to or shorter than bracts, pubescent with both eglandular and glandular hairs, erecto-patent at anthesis, erecto-patent to recurved at fruiting, (0.5–)1–3(–5) mm long. Flowers protandrous, those on individual plants all hermaphrodite. Calyx rounded at base, 2.3–3.5 mm long, 4-lobed, equally divided or rarely with anterior lobes united to 2⁄3 of the way to apex (seen on one specimen only); lobes lanceolate (usually) to ovate or elliptic, acute (usually) to obtuse, eglandular ciliolate or with mixed glandular and eglandular cilia, margins membranous. Corolla pale mauve at anthesis, white after pollination; tube glabrous, 3– 4 mm long, 1.5–2 mm wide, expanded in lower half and contracted at base, longer than calyx (Fig. 10B); lobes equalling or shorter than corolla tube, glabrous; posterior lobe elliptic to lanceolate, subacute, suberect, with margin and apex turned upwards; lateral lobes elliptic, subacute, suberect, cuneate at base, with margin and apex turned upwards; anterior lobe elliptic to oblong, subacute, suberect, with margin and apex turned upwards or with margin and apex flat, sometimes enfolding style; corolla throat white. Stamen filaments white, remaining erect or diverging after anthesis, straight at apex in bud, 3– 4(–4.5) mm long; anthers apiculate, pale mauve or violet or white, 1.6–1.8(–2.2) mm long. Nectarial disc glabrous. Ovary ovoid, glabrous, 1–1.5 mm long; ovules 6–14 per locule, marginal in one layer on a flattened placenta; style 5–7.5 mm long, c. 0.2 mm thick, glabrous, white or mauve (pale, at anthesis); stigma capitate (narrowly), yellow at anthesis, 0.2–0.3 mm wide. Capsules latiseptate, acute, pale to dark brown, 3.2–4.5 mm long, 2–3 mm wide, glabrous, loculicidal split extending ½–¾ of the way to base. Seeds 6–10 per locule, flattened, ellipsoid, not winged, smooth, pale brown, 1.2 mm long, 0.9 mm wide.

H. rigidula et H. colensoi similis sed a primo gemmis tetragonis valde, pedicellis (0.5–)1.5– 3.0(–5.0) mm longis, foliis (17–)20–35(–43) mm longis et (4–)5–9(–11.3) mm latis differt; a H. colensoi non glaucifoliis plerumque, tubo corollae calycem superantibus et pilis in ramulis et marginibus calycum dispositum differt.

Subshrub, to 0.3 m tall (Fig. 1A,B). Branches decumbent, or ascending; old stems brown; youngest branchlets green, or red-brown; internodes (2.8–)3.5–6.5(–9.7) mm long; leaf decurrencies evident; leaf-base scars evident and sometimes prominent; stem pubescence bifarious, eglandular. Leaf bud about as long as mature leaves with leaves of a pair separating when mature; sinus broad and acute (Fig. 1D). Leaves subdistichous, erect or erecto-patent; lamina elliptic to obovate, coriaceous, concave, (5–)9–24(–37) mm long, (2–) 4–8.5(–10) mm wide; apex obtuse to subacute; base cuneate; evident venation in fresh leaves consisting of midrib only; midrib slightly thickened beneath and slightly depressed to grooved above; margin not thickened, rounded to slightly bevelled, glabrous or minutely ciliolate (especially toward apex), entire; upper surface glaucescent to glaucous, dull, with dense stomata, hairy along midrib and/or hairy toward base; lower surface glaucescent to glaucous, dull, densely covered with stomata, glabrous. Petiole 1–2 mm long, hairy above and/or hairy along margins. Inflorescences with 10–25 flowers, lateral, racemose and unbranched, 1.5–3.5 cm long (Fig. 1F), longer than subtending leaves (Fig. 1C), flowers opening in acropetal sequence, with all flowers (including those near the apex) developing to maturity; peduncle 0.45–0.7 cm long, eglandular pubescent; rachis 0.65–2.4 cm long, eglandularpubescent; bracts with lowermost pair opposite, then subopposite or alternate above, free, obtuse to subacute, ciliate with both glandular and eglandular hairs, suborbicular to broadly deltoid; pedicels shorter than bracts, eglandular pubescent, suberect at anthesis, suberect at fruiting, 0.2–1(–1.7) mm long. Flowers on individual plants all hermaphrodite. Calyx tapered at base, (2–)2.5–3.5 mm long, 4- lobed, equally divided or with anterior lobes united to 2⁄3 of the way to apex (Fig. 2); lobes elliptic (sometimes broadly), subacute to obtuse, with mixed glandular and eglandular cilia, margins membranous and sometimes tinged pink. Corolla white at anthesis, white after pollination; tube glabrous, 2–2.5 mm long, c. 1.5 mm wide, funnelform, c. equalling calyx (Fig. 1H); lobes slightly longer than corolla tube, glabrous; posterior lobe elliptic to circular or ovate, obtuse, suberect to patent, with margin and apex flat or turned upwards; lateral lobes elliptic to circular or ovate, obtuse, suberect to patent, with margin and apex flat or turned upwards; anterior lobe elliptic, obtuse, suberect to patent, with margin and apex flat or turned upwards; corolla throat white. Stamen filaments white, slightly diverging after anthesis, straight at apex in bud, c. 2.8–3.5 mm long; anthers subacute or shortly apiculate, purple, 1.7–2 mm long. Nectarial disc glabrous. Ovary ovoid, glabrous, 1– 1.4 mm long; ovules c. 11–14 per locule, marginal in one layer on a flattened placenta; style 5–5.5 mm long, c. 0.2 mm thick, glabrous, white; stigma no wider than style or subcapitate, yellow at anthesis, c. 0.175–0.2 mm wide. Capsules (Fig. 1E) latiseptate, subacute or acute, pale brown, 3.7–5 mm long, 2.4–3.2 mm wide, glabrous, loculicidal split extending up to 1⁄3 way to base.⅓

Fruiticulus decumbens ad 30 cm altum, rami apicales ascendentes sine ramulis per (6–)11–24(–37) cm ab apici. Gemma folii sinu lati acuti instructi. Folia elliptica ad obovata (5–)9–24(–37) mm longa, (2–)4–8.5(–10) mm lata, glauca vel glaucescentia in paginis ambabis. Inflorescentiae simplices constanter, floribus in axillis bracteorum omnium effectis, bractea quam calyx breviora, pedicelli 0.2–1.0(–1.7) mm longi. Corolla alba, tubo calycem c. aequitante.