Seed Study - Pascopyrum smithii
Pascopyrum smithii (Agropyron smithii) - Western Wheatgrass NPS Graphic Species: Pascopyrum smithii (Agropyron smithii) Vegetative identification: Emerges green with a very narrow spindly leaf, and gradually turns the distinctive blue-green color. The prominent veins and claw-like auricles are visible fairly early in growth. Seedlings are sometimes purplish or brown at the base and the emerging leaf often forms a corkscrew shape. 
NPS Photo Pascopyrum smithii – western wheatgrass Average number of good seeds per gram bulk matter: 15 Average number of good seeds per gram cleaned: 275 Commercial estimates of seeds per gram: 243; 300 Percent seed: 9.5 Percent live: n.m. Collection dates: September 26; October 7 and 25 Collection effort: 370 gram in 14 person hours Collection notes: Even though this species is a dominant grass in the park, in 2004 when we were trying to collect seed for the project we found no plants producing seed and very few even flowering. It was assumed this was because of drought. The seed used in the project was collected on private and Forest Service lands south of Custer SD. Plants there that produced seed were generally in shaded areas or at the bases of rock outcrops where moisture may have accumulated. Cleaning notes: Bulk measurement included stems, leaves, lemmas, glumes, etc. Clean seed measurement was hard seed with a small amount of lemma and glume. |
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