Rytidosperma thomsonii (Buchanan) Connor & Edgar
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Rytidosperma thomsonii (Buchanan) Connor & Edgar, New Zealand J. Bot. 17: 322 (1979)
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Nomenclature
(Buchanan) Connor & Edgar
Buchanan
Connor & Edgar
1979
322
ICN
species
Rytidosperma thomsonii
Classification
Synonyms
Descriptions
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Variable in size and habit, from low-growing tussocks to moderately tall tufts, rather dull green, ± shortly rhizomatous; leaves semi-pungent, usually much < culms; new shoots intravaginal, crowded, ± swollen at base. Sheaths pale to greyish, glabrous, sometimes with scattered long hairs; collar hairs 1- 3 mm long; ligule c. 0.3 mm long; lamina to 15—(22) cm long, stiff, inrolled with scabrous margins, glabrous, or with scattered long hairs. Culms up to 45 cm long, glabrous, minutely scabrous below inflorescence. Panicle strict, up to 6.5 cm long, shortly branched below, with few to many spikelets on short pedicels; rhachis and pedicels closely short-scabrous, with numerous minute hairs interspersed, longer hairs below spikelets and at branch axils. Spikelets 5-8-flowered, sometimes upper florets exceed glumes. Glumes purpled centrally, ovate-lanceolate, subacute, (3.5)-5-7-(9) mm long, ± equal, lower 5- (7)-nerved, upper 3-(5)-nerved. Lemma 2.5-3.5- (4) mm long, finely 7-(9)-nerved, both rows of hairs reduced to short dense marginal tufts, elsewhere glabrous, upper hairs < lemma lobes; lemma lobes reduced to minute bristles, rarely almost wanting, 0.1-0.4-(0.6) mm long. Central awn (0.2)-0.5-1- (2.5) mm long, straight, erect, fine, or reduced to a mucro from a bifid lemma-tip; column not developed. Palea 2.3-3 mm long, < or reaching almost to base of sinus, much > upper lemma hairs, glabrous between keels and on margins. Callus 0.2- 0.3 mm long with thick marginal hair tufts reaching base of lower marginal lemma tufts. Rhachilla c. 0.5 mm long. Anthers 0.4-0.7 mm long, Caryopsis 1-1.3 × 0.4-0.7 mm; embryo to 0.5 mm long; hilum c. 0.2 mm long. Endemic.
Rytidosperma thomsonii (Buchanan) Connor & Edgar
2n = 24, 48
2n = 24
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Variable in size and habit, from low-growing tussocks to moderately tall tufts, rather dull green, ± shortly rhizomatous; leaves semi-pungent, usually » culms; branching intravaginal, shoots crowded, ± swollen at base. Leaf-sheath pale to greyish, glabrous, sometimes with scattered long hairs; apical tuft of hairs 1-3 mm. Ligule c. 0.3 mm. Leaf-blade to 15-(22) cm, stiff, inrolled with scabrid margins, glabrous, or with scattered long hairs. Culm to 45 cm, internodes smooth but minutely scabrid below inflorescence. Panicle strict, to 6.5 cm, shortly branched below, of few to many spikelets on short pedicels; rachis and pedicels closely short-scabrid, with numerous minute hairs interspersed, longer hairs below spikelets and at branch axils. Spikelets 5-8-flowered, sometimes upper florets exceeding glumes. Glumes purplish centrally, ovate-lanceolate, subacute, (3.5)-5-7-(9) mm, ± equal; lower 5-(7)-nerved, upper 3-(5)-nerved. Lemma 2.5-3.5-(4) mm, finely 7-(9)-nerved, both rows of hairs reduced to short dense marginal tufts, elsewhere glabrous, upper hairs < lemma lobes; lobes reduced to minute bristles, 0.1-0.4-(0.6) mm, rarely almost wanting; central awn (0.2)-0.5-1-(2.5) mm, straight, erect, fine, or reduced to a mucro from a bifid lemma-tip, column absent. Palea 2.3-3 mm, ≤ base of sinus, » upper lemma hairs, interkeel and margins glabrous. Callus 0.2-0.3 mm, thick marginal hair tufts reaching base of lower marginal lemma tufts. Rachilla c. 0.5 mm. Anthers 0.4-0.7 mm. Caryopsis 1-1.3 × 0.4-0.7 mm; embryo to 0.5 mm; hilum c. 0.2 mm. Plate 12G.
Taxonomic concepts
Danthonia thomsonii Buchanan
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Notodanthonia thomsonii (Buchanan) Zotov
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Triodia thomsonii (Buchanan) Petrie
Rytidosperma thomsonii (Buchanan) Connor & Edgar
Collections
Identification keys
Metadata
51db306c-cbd4-4981-b4ba-81ac0c414e26
scientific name
Names_Plants
1 January 2000
21 March 2006