Difference between revisions of "Piptochaetium stipoides"
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|distribution=Calif. | |distribution=Calif. | ||
| − | |discussion=<p | + | |discussion=<p>Piptochaetium stipoides is native to South America. There is one known population in the Flora region, in Marin County, California, which grows with P. setosum in a meadow adjacent to an old dirt road. The origin of the population is not known; it has been suggested that the seeds might have been brought in by birds, as the area was a bird refuge at one time.</p><!-- |
| − | --><p>The Californian plants belong to | + | --><p>The Californian plants belong to Piptochaetium stipoides (Trin. & Rupr.) Hack. var. stipoides, which differs from the only other variety recognized by Cialdella and Arriaga (1998), P. stipoides var. echinulatum Parodi, in having lemmas that are mostly smooth as well as a less revolute crown.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|basionyms= | |basionyms= | ||
|family=Poaceae | |family=Poaceae | ||
| + | |illustrator=Cindy Roché | ||
|distribution=Calif. | |distribution=Calif. | ||
|reference=None | |reference=None | ||
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|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/314eb390f968962f596ae85f506b4b3db8683b1b/coarse_grained_fna_xml/V24/V24_229.xml |
|subfamily=Poaceae subfam. Pooideae | |subfamily=Poaceae subfam. Pooideae | ||
|tribe=Poaceae tribe Stipeae | |tribe=Poaceae tribe Stipeae | ||
Revision as of 17:06, 30 October 2019
Culms 20-60 cm, erect to ascending; nodes 2-4, dark, glabrous. Sheaths glabrous or hispidulous towards the collar; ligules 0.8-2 mm, glabrous, abaxial surfaces scabridulous, margins occasionally ciliate; blades (5)14-30 cm long, 0.2-0.4 mm wide, linear, glabrous or villous, margins scabridulous. Panicles 4-15 cm long, 1.5-3 cm wide, with 10-70 spikelets; branches ascending, scabridulous; pedicels 1-11 mm, hispid. Glumes subequal, 4-8.5 mm long, 1.5-2 mm wide, purple towards the base, glabrous, 5-veined, apices aristulate; florets 2.3-4(5) mm long, 0.8-2.3 mm thick, obovoid, globose to laterally compressed; calluses 0.5-0.6 mm, blunt, hairs white to golden tan; lemmas shiny, glabrous, striate, dark brown to black at maturity, wholly smooth to conspicuously verrucose or sharply papillose, at least distally, constricted below the crown; crowns well-developed, 0.6-1.6 mm wide, distal margins slightly to strongly revolute, inner surfaces densely covered with hooks and hairs; awns 15-25 mm, eccentric, twice-geniculate, tardily deciduous; paleas 2.5-5 mm; lodicules 2, linear; anthers about 0.5 mm. Caryopses 1.5-2.5 mm, spherical to ellipsoid. 2n = unknown.
Discussion
Piptochaetium stipoides is native to South America. There is one known population in the Flora region, in Marin County, California, which grows with P. setosum in a meadow adjacent to an old dirt road. The origin of the population is not known; it has been suggested that the seeds might have been brought in by birds, as the area was a bird refuge at one time.
The Californian plants belong to Piptochaetium stipoides (Trin. & Rupr.) Hack. var. stipoides, which differs from the only other variety recognized by Cialdella and Arriaga (1998), P. stipoides var. echinulatum Parodi, in having lemmas that are mostly smooth as well as a less revolute crown.
Selected References
None.