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FOC | Family List | FOC Vol. 22 | Poaceae

88. Calamagrostis Adanson, Fam. Pl. 2: 31, 530. 1763.

拂子茅属 fu zi mao shu

Authors: Sheng-lian Lu & Sylvia M. Phillips

Perennials, often robust, sometimes rhizomatous. Leaf blades linear, usually flat; ligule membranous. Inflorescence a panicle, loosely contracted to dense and spikelike, often plumose, branches usually whorled, bearing numerous spikelets. Spikelets with 1 floret; rachilla disarticulating above glumes, extension beyond floret absent or small and glabrous, rarely better developed and penicillate; glumes persistent, subequal or unequal with lower longer, narrowly lanceolate, much exceeding floret, lower glume 1-veined, upper glume 3-veined at base, apex finely acuminate or subulate; floret callus conspicuously bearded, hairs much exceeding floret; lemma ca. 1/2 as long as glumes, hyaline, 3–5-veined, awned, apex erose, denticulate or deeply 2-lobed; awn very slender, straight or almost so, arising from lemma back, apex or between teeth; palea 1/2 as long to slightly shorter than lemma. Stamens usually 3, rarely 1.

About 20 species: N temperate and arctic regions; six species (one endemic) in China.

Calamagrostis intergrades with both Agrostis and Deyeuxia, and the number of species in the genus is very uncertain. As in Deyeuxia, the taxonomy is complicated by polymorphic species complexes arising from polyploidy, apomixis, and hybridization.

1 Awn arising from lemma apex or between apical teeth   (2)
+ Awn arising from lemma back   (4)
2 (1) Lemma 5-veined, apex deeply 2-toothed; awn 5–9 mm, arising between teeth; stamen 1.   1 C. emodensis
+ Lemma 3-veined, apex entire or slightly toothed; awn 0.5–3 mm, arising from apex; stamens 3   (3)
3 (2) Culms 40–150 cm; nodes (2–)3–6; panicle fairly lax, 10–30 cm.   2 C. pseudophragmites
+ Culms 20–70 cm; nodes 2–3; panicle dense, 4–13 cm.   3 C. hedinii
4 (1) Spikelets 7–11 mm; glumes unequal, upper 1–1.5 mm shorter than lower.   4 C. macrolepis
+ Spikelets 3–7 mm; glumes subequal, upper less than 1 mm shorter than lower   (5)
5 (4) Culms 15–45 cm; spikelets 3–4 mm; awn 4.5–5 mm.   30 Deyeuxia debilis (see p. 358)
+ Culms 45–150 cm; spikelets 4–7 mm; awn 1.5–3 mm   (6)
6 (5) Awn arising near middle of lemma back; lemma 3–3.5 mm; rachilla extension absent or glabrous if present   5 C. epigeios
+ Awn arising from upper 1/3 of lemma back; lemma 4–5 mm; rachilla extension present, penicillate.   6 C. kengii

Lower Taxa


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