Deyeuxia youngii (Hook.f.) Buchanan
Details
Deyeuxia youngii (Hook.f.) Buchanan, Indig. Grasses N. Zeal. add et corrig. 11 (1880)
Nomenclature
(Hook.f.) Buchanan
Hook.f.
Buchanan
1880
11
ICN
species
Deyeuxia youngii
Classification
Descriptions
Deyeuxia youngii (Hook.f.) Buchanan
2n = 28
Deyeuxia youngii (Hook.f.) Buchanan
Tufts rather narrow, 30-130 cm tall; innovations extravaginal. Leaf-sheaths chartaceous with membranous margins, distinctly nerved, smooth or finely ciliate, light green to light brown; ligule 0.8-2.5 mm, truncate, ciliate to lacerate across top, abaxially smooth, or densely ciliate-scabrous; leaf-blades 12- 35-(60) cm × 1-4 mm, stiff, flat to frequently rolled, especially towards tip, abaxially smooth, adaxially distinctly ridged and finely scabrous on ridges, margins finely scabrous, tip filiform, acute. Culms 40-115 cm, mostly smooth, but sparsely scabrous below panicle; nodes conspicuous. Panicle 7—16— (22) cm × 5-23 mm, linear-lanceolate, shortly and narrowly branched, or more open below; rachis smooth, branchlets slightly scabrous, with ± densely crowded spikelets on slightly scabrous pedicels. Spikelets 4.5-7.5 mm, light green or purplish. Glumes 1-nerved, submembranous, elliptic-lanceolate, acute, scabrous on surface near tip, keel scabrous throughout. Lemma (4)-5-6 mm, slightly < glumes, subcoriaceous, scabrous throughout, elliptic-lanceolate, tip denticulate; awn (0.5)—1— 3 mm, straight, from upper 1/3 of lemma or rarely mid-dorsal, usually barely reaching lemma tip but occasionally overtopping it, rarely awn 0. Palea ± = lemma, scabrous on and between keels. Lodicules 0.6-0.8 mm, linear, acute. Callus hairs fine, ± dense, c. ½ length of lemma. Rachilla 1.5-2.5 mm, tipped by dense tuft of fine hairs 2-3-(3.5) mm, almost reaching lemma tip. Anthers 1.2-1.9 mm, penicillate. Caryopsis 2.5-3 × 0.7-1 mm. Endemic.
Deyeuxia youngii (Hook.f.) Buchanan
Tufts rather narrow, 30-130 cm; branching extravaginal. Leaf-sheath chartaceous with membranous margins, distinctly ribbed, glabrous or finely hairy, light green to light brown. Ligule 0.8-2.5 mm, truncate, ciliate to lacerate, abaxially smooth, or densely minutely pubescent-scabrid. Leaf-blade 12-35-(60) cm × 1-4 mm, stiff, flat to frequently rolled, especially towards tip, abaxially smooth, adaxially distinctly ribbed and finely scabrid on ribs; margins finely scabrid, tip filiform, acute. Culm 40-115 cm, nodes conspicuous, internodes mostly smooth, but sparsely scabrid below panicle. Panicle 7-16-(22) cm × 5-23 mm, linear-lanceolate, shortly and narrowly branched, or more open below; rachis smooth, branches slightly scabrid, with ± densely crowded spikelets on slightly scabrid pedicels. Spikelets 4.5-7.5 mm, light green or purplish. Glumes 1-nerved, submembranous, elliptic-lanceolate, acute, scabrid near apex, keel scabrid. Lemma (4)-5-6 mm, ≈ glumes, subcoriaceous, scabrid, elliptic-lanceolate, apex denticulate; awn (0.5)-1-3 mm, straight, from upper ⅓ of lemma or rarely middorsal, usually barely reaching but occasionally overtopping lemma apex, rarely awn 0. Palea ˜ lemma, keels and interkeel scabrid. Callus hairs fine, ± dense, c. ½ length of lemma. Rachilla prolongation 1.5-2.5 mm, tipped by dense tuft of fine hairs 2-3-(3.5) mm, almost reaching lemma apex. Lodicules 0.6-0.8 mm, linear, acute. Anthers 1.2-1.9 mm, penicillate. Caryopsis 2.5-3 × 0.7-1 mm.
Taxonomic concepts
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Deyeuxia youngii (Hook.f.) Buchanan
Collections
Identification keys
Metadata
3192fcda-1ad5-4df1-9794-8eb2a82043fd
scientific name
Names_Plants
1 January 2000
18 April 2022