All Floras      Advanced Search
FOC Vol. 22 Page 316, 325, 330 Login | eFloras Home | Help
FOC | Family List | FOC Vol. 22 | Poaceae

78. Trisetum Persoon, Syn. Pl. 1: 97. 1805.

三毛草属 san mao cao shu

Authors: Zhen-lan Wu & Sylvia M. Phillips

Perennials, tufted, sometimes shortly rhizomatous. Leaf blades narrowly to broadly linear, usually flat; ligule membranous. Inflorescence a moderately lax to spikelike panicle, shining. Spikelets with 2 or 3 florets, disarticulating below each floret; rachilla shortly bearded, extended beyond uppermost floret, tipped by a reduced or vestigial floret; glumes lanceolate, unequal or subequal, shorter than spikelet, keeled, herbaceous or membranous, margins broad, hyaline, lower glume 1(–3)-veined, upper glume 3-veined, apex acute or acuminate; floret callus glabrous or shortly bearded; lemmas lanceolate, laterally compressed, membranous to thinly leathery, 5-veined, glabrous, awned from above middle of back, apex 2-toothed, teeth often aristulate; awn geniculate with twisted column or merely outwardly curved; palea hyaline, slightly to distinctly shorter than lemma, gaping free from lemma margins. Ovary glabrous or almost so. Caryopsis with punctiform hilum; endosperm sometimes liquid.

About 70 species: temperate regions of the world except Africa, also on tropical mountains; 12 species (five endemic) in China.

1 Culm below panicle and panicle branches pubescent to tomentose (except T. altaicum); panicle contracted to dense and spikelike; plants often less than 50 cm tall   (2)
+ Culm and panicle branches glabrous; panicle lax; plants often more than 40 cm tall   (6)
2 (1) Culm glabrous; panicle branches smooth, glabrous.   1 T. altaicum
+ Culm pubescent to tomentose; panicle branches pubescent   (3)
3 (2) Plant rhizomatous; culms stout, 2–3 mm thick; panicle scarcely exserted from uppermost leaf sheath.   2 T. kangdingense
+ Plant tufted; culms slender, 0.5–2 mm thick; panicle clearly exserted from uppermost leaf sheath   (4)
4 (3) Palea keels densely ciliate; ovary pilose.   5 T. debile
+ Palea keels scabrid; ovary glabrous   (5)
5 (4) Panicle dense, spikelike, cylindrical to ovoid, 1.5–11 cm; branches erect, appressed; glumes and lemmas lanceolate; anthers 0.7–1.3 mm.   3 T. spicatum
+ Panicle contracted but not dense and spikelike, lanceolate to subcylindrical, 5–18 cm; branches usually obvious, slightly spreading; glumes and lemmas narrowly lanceolate; anthers 1.3–1.6 mm   4 T. clarkei
6 (1) Floret callus hairy   (7)
+ Floret callus glabrous   (8)
7 (6) Lemmas conspicuously punctate-scabrid; palea 1/2–2/3 lemma length.   6 T. bifidum
+ Lemmas smooth; palea subequal to lemma.   7 T. yunnanense
8 (6) Panicle branches single or paired; awns 9–14 mm, geniculate with twisted column; anthers 1–1.5 mm.   8 T. scitulum
+ Panicle branches in whorls of 3–8; awns 4.5–9 mm, recurved or basally slightly twisted; anthers 2–3 mm   (9)
9 (8) Culm stout, 4–5 mm in diam.; lemmas pale yellowish green, herbaceous with broad hyaline margins.   9 T. henryi
+ Culm slender, 1.5–3 mm in diam.; lemmas brown at maturity, firm with narrow margins   (10)
10 (9) Florets 2–4; lemmas 5–7 mm; awns up to 9 mm, strongly recurved.   10 T. sibiricum
+ Florets 1 or 2; lemmas 4.5–5.5 mm; awns up to 6.5 mm, recurved or straight   (11)
11 (10) Margins of leaf sheaths joined below middle; awns almost straight.   11 T. umbratile
+ Margins of leaf sheaths joined to middle or above; awns recurved.   12 T. pauciflorum

  • List of lower taxa


    Related Objects  
  • Trisetum.pdf
  • PDF

  • Flora of China @
    Browse by
    Advanced Search

    Flora of China Home




     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |