Manual of the Vascular Plants of Texas, Volume 6

achene acuminate acute annual anthers anthesis apex apically appressed Ariz ascending axillary axils axis basally base bracts branches branchlets broad broadly calyx capsule ciliate culms cuneate deciduous densely diameter Edwards Plateau elliptic elongate erect exserted filaments flat floret flowers fruit genus glabrate glabrous glomerules glume hairs herb hyaline inflorescence internodes involute keeled lanceolate leaf blades leaves lemma less ligule linear lobes margins maturity minutely moist narrow narrowly nearly nerves nodes oblong obovate obtuse Okla ovary ovate ovoid palea panicle pedicels peduncles perianth perianth segments perigynia persistent petals petioles pilose pistillate Plains Country plants puberulent pubescent racemes rachis rarely rhizomes Rio Grande Plains rounded s.e. Tex sandy scales scape second glume seeds sepals sessile sheaths short shorter slender slightly smooth soils solitary sparsely species spikelets spikes spreading stamens stems sterile stout style summer-fall tall tepals terete terminal Texas thick Trans-Pecos Tufted perennial upper usually wide