Aristida schiedeana
Common names: Single threeawn
Treatment appears in FNA Volume 25. Treatment on page 323.
Plants perennial; cespitose. Culms 30-120 cm, erect, unbranched. Leaves basal and cauline, pale green, sometimes glaucous; sheaths longer or shorter than the internodes, glabrous except at the summit; collars densely to sparsely pilose or glabrous; ligules less than 0.5 mm; blades 8-30 cm long, 1-2 mm wide, usually flat, often curled at maturity. Inflorescences paniculate, 10-30 cm long, (4)8-26 cm wide; rachis nodes with straight hairs, hairs to 0.8 mm; primary branches 6-16 cm, abruptly spreading to divaricate, stiff to lax, with axillary pulvini, usually not spikelet-bearing below midlength. Spikelets appressed, rarely spreading. Glumes 1(3)-veined, brown or purple at maturity, acuminate; lower glumes 6-13 mm; upper glumes equaling or to 4 mm shorter than the lower glumes; calluses 0.8-1.2 mm; lemmas 10-15(17) mm, terminating in a strongly twisted, 2-4 mm awnlike beak, junction with the awns not conspicuous; awns not disarticulating at maturity; central awns 5-12 mm, markedly bent near the base; lateral awns absent or to 1(3) mm, erect; anthers 1.2-2.2 mm, brownish. Caryopses 6-8 mm. 2n = 22, 44.
Distribution
Calif., Ariz., N.Mex., Tex.
Discussion
Aristida schiedeana grows on rocky slopes and plains, generally in pinyon-juniper, oak, or ponderosa pine communities. Plants from the southwestern United States and northern Mexico belong to A. schiedeana var. orcuttiana (Vasey) Allred & Valdes-Reyna, in which the lower glumes are usually glabrous and longer than the upper glumes, and the collar and throat are usually glabrous. Aristida schiedeana var. schiedeana grows in Mexico, Guatemala, Nicaragua, and Honduras, and has puberulent, equal glumes and pilose collars and throats.
References
None.
Lower Taxa
No lower taxa listed.
Facts about "Aristida schiedeana"
Author | Kelly W. Allred + |
Authority | Trin. & Rupr. + |
Common name | Single threeawn + |
Distribution | Calif. +, Ariz. +, N.Mex. + and Tex. + |
Illustrator | Linda A. Vorobik and Andy Sudkamp + |
Reference | None + |
Source xml | https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/314eb390f968962f596ae85f506b4b3db8683b1b/coarse grained fna xml/V25/V25 994.xml + |
Synonyms | Gramineae + |
Taxon family | Poaceae + |
Taxon name | Aristida schiedeana + |
Taxon parent | Aristida + |
Taxon rank | species + |
Volume | Volume 25 + |