Oryzopsis


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Oryzopsis

 

a genus of perennial herbs of the family Gramineae. The genus includes one species—Oryzopsis asperifolia. The plant is loosely tufted and has broad leaves that are pubescent below. The inflorescence is racemose and narrow. The spikelets are one-flowered and borne by stalks. The lemma has overlapping margins and an awn at the apex. The ovary has styles that are grown together almost its entire length. O. asperifolia grows in mountain forests of North America. The genus Piptatherum is often included in the genus Oryzopsis.

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Piptatherum = 1, included in Oryzopsis by Tateoka (1962).
Among Stipeae, Tateoka (1962) scored eight species of Stipa, and eight species of other genera, Oryzopsis, Piptochaetium, Achnatherum P.
campestris Baileya pleniradiata HP Chaenactis fremontii A Oryzopsis hymenoides HP C.
A Not infested Dicoria canescens A Not infested Erioneuron pluchellum HP Not infested Malacothrix glabrata A Not infested Muhlenbergia porteri HP Not infested Oryzopsis hymenoides HP 8.3 [+ or -] 2.2 Sphaeralcea amnbigua HP 6.7 [+ or -] 2.1 Sporobolus cryprandrus HP Not infested
Influence of heteromyid rodents on Oryzopsis hymenoides germination.
Quality and germinability of Oryzopsis hymenoides seed in Lahontan sands.
A separate set of trials was run at all colonies for two seed species: Oryzopsis hymenoides, a native species, and Panicum miliaceum (millet), a non-native species.
Seed patches consisted of 5 g of Oryzopsis hymenoides seeds.
Seeds of Oryzopsis hymenoides were also used for these seed presentations.
In the first experiment, ants removed significantly more Oryzopsis and Panicum seeds from patches 20 cm from the trunk-trail than from 100 cm patches at both 3 and 6 m, but not at 9 m (Table 1).
2 Grass Agropyron 2 2 Agrostis 1 Alopecurus 1 4 Bromus 1 10 Dactylis 1 24 Festuca 2 17 Leymus 1 6 Lolium 1([dagger]) 5 Oryzopsis 1 Phalaris 1 4 Phleum 7 Poa 2([dagger]) 1 Psathyrostachys 1 7 Pseudoroegneria 1 Thinopyrum 1 1 Triticum 11([dagger]) Pop.
In the shrub-grassland area where soils are coarsely textured, the saltbush is more widely spaced and there are numerous small shrubs (Artemisia frigida, Eriogonum effusum, Gutierrezia sarothrae, Chrysothamnous nauseous, Ceratoides lanata) and perennial bunch-grasses (Stipa comata, Oryzopsis hymenoides, Aristida longiseta, Sitanion hystrix).