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FOC | Family List | FOC Vol. 22 | Poaceae | Agrostis

18. Agrostis sozanensis Hayata, Icon. Pl. Formosan. 7: 85. 1918.

台湾剪股颖 tai wan jian gu ying

Agrostis canina Linnaeus var. formosana Hackel; A. transmorrisonensis Hayata; A. transmorrisonensis var. opienensis Keng ex Y. C. Yang.

Perennial, loosely tufted, shortly rhizomatous. Culms erect or ascending, up to 90 cm tall, 1–1.2(–2.5) mm in diam., 3–5-noded. Leaf sheaths smooth; leaf blades narrowly linear, flat or weakly involute toward apex, 7–20 cm × 2–5 mm, both surfaces scabrid; ligule 2–6 mm, apex obtuse or truncate. Panicle open, lax, broadly elliptic to narrowly ovate in outline, 15–30 cm; branches 2–4(–10) per node, capillary, widely ascending, flexuous, up to 10 cm, scabrid, lower 1/2–2/3 bare. Spikelets 1.8–2.7(–3) mm, green or tinged purplish red; glumes subequal or lower glume slightly longer than upper glume, keel scabrid, apex acute or acuminate; callus hairs 0.1–0.2 mm; lemma 2/3–3/4 spikelet length, awned from middle or above, apex obtuse or truncate; awn variable, up to 2(–3) mm, straight or slightly bent; palea 0.25–0.5 mm, 1/4–1/3 lemma length. Anthers 0.7–1.2 mm. Fl. and fr. summer and autumn.

* Moist ground, near roads, on slopes; below 2700 m. Anhui, Fujian, Guangdong, Guizhou, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang.

The development and position of the awn are variable in this species. It is usually bent and exserted from the spikelet, but may be shorter and straight. It may arise from the middle to the upper quarter of the lemma back. Occasionally, awnless spikelets may occur in a panicle where most spikelets are awned. The distinction from Agrostis infirma is based mainly on the presence of awns, coupled with slightly longer paleas and anthers.

Agrostis sozanensis is very close to A. canina Linnaeus. Agrostis canina is distinguished by the presence of creeping surface stolons, an awn arising from the lower part of the lemma back, and anthers 1–1.5 mm.

The name Agrostis perennans (Walter) Tuckerman has been misapplied to A. sozanensis. Agrostis sozanensis and A. transmorrisonensis were published simultaneously, but A. sozanensis has priority when they are regarded as synonyms, since A. sozanensis was chosen first, by Koyama (Grasses Japan Neighboring Regions, 485. 1987). The identity of the taxon named A. transmorrisonensis var. kunyushanensis F. Z. Li (Bull. Bot. Res., Harbin 11(2): 28. 1991), described from Shandong (Kunyu Shan), is uncertain. The type has not been seen.


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