Microstegium 莠竹屬
型態特徵
Annuals or perennials; culms ribbed or terete, smooth. Leaf blade suddenly narrowed at base, often petiole-like. Inflorescence consisting of several spike-like racemes digitately arranged. Racemes many noded, breaking up at maturity. Spikelets in pairs, one pedicelate, finally falling off from pedicel, other usually sessile and falling off with adjacent joint of rachis, rarely shortly pedicelate and deciduous at maturity. Spikelets oblong, dorsally compressed, usually awned, with short, bearded callus, dorsiventrally arranged; lower glume as long as spikelets or slightly shorter, apex truncate or 2-toothed, with a longitudinal depression abaxially, margins inflexed, without midnerve; upper glume as long as spikelet, boat shaped keeled, acute, acuminate or awned, 3-nerved; lower lemma, if present hyaline, nerveless; lower palea present or absent, often apparently substituting for a lower lemma; upper lemma thinly membranaceous, entire, 2-toothed or 2-lobed usually awned, awn slender, flexuous; upper palea small or wanting; lodicules 2, curieate, small; stamens 3; stigmas exserted at or below apes. Caryopsis oblong.
About 30 species distributed in tropics and subtropics of Africa and Asia; eight species, mostly forest grasses in mountainous regions of Taiwan.
種列表
- Microstegium brandisii 布氏莠竹
- Microstegium ciliatum 剛莠竹
- Microstegium dilatatum 大穗莠竹
- Microstegium fasciculatum 蔓生莠竹
- Microstegium fauriei 法利莠竹
- Microstegium geniculatum 曲膝莠竹
- Microstegium glaberrimum 短軸莠竹
- Microstegium glabratum 光莠竹
- Microstegium japonicum 日本莠竹
- Microstegium nudum 竹葉茅
- Microstegium pseudeulalia
- Microstegium somai 相馬莠竹
- Microstegium sp.
- Microstegium spectabile 大莠竹
- Microstegium tenue 纖細莠竹
- Microstegium vimineum 柔枝莠竹
- Microstegium vimineum var. typicum
