acuminate, scabrous on the keel, the first 

 slenderly acuminate and 5.5-6 mm long, the second 

 broader, about 6.3 mm long, about equalling the 

 first floret but shorter than the second and 

 third; lemmas rounded on the back, obscurely 

 5-nerved , very minutely scabrous on the upper 

 part, the summit acute or subacute, slightly 

 erose— toothed , about 5—6 mm long, awned from the 

 back about 1-2 mm below the summit, the awn 

 straight or only slightly geniculate, 3-6 mm 

 long; palea narrower and shorter than the lemma; 

 bearding of the callus about 0.5 mm long, 

 that of the rachilla about 1 mm long; the first 

 floret about 6 mm long, the second slightly 

 shorter, the third floret often reduced or absent; 

 anthers about 1 mm long, apparently non-functional 

 (adapted from Hitchcock, 193^; Hitchcock et. 

 al . , 1969). 



Local -field characters: At every known location, 

 Tr isetum orthochaetum is found growing in close 

 proximity with two other Tr i setum species: T_. 

 canescens and T. wo 1 f i i . These tana are most 

 readily distinguished by awn features; T. wo If i i 

 lacks any awns on the lemmas, at least in the 

 region covered in this study, while T. canescens 

 has long awns (ca. 10-1^ mm), which are geniculate 

 in maturity. In contrast, T. orthochaetum has 

 awns which are about 3—6 mm long, and are straight 

 or become only slightly geniculate. In addition, 

 T. wo If i i most often has only two florets per 

 spikelet in the area of study, while the other 

 taxa generally have three (the third floret is 

 often reduced in T_. orthochaetum ) . A small ring 

 of white hairs can be found on the sheaths, just 

 above the upper nodes, in T^. canescens and T. 

 orthochaetum , but is absent in T. wo If i i . The 

 inflorescences vary in their degree of arching; T. 

 wolf i i generally has a strictly upright 

 inflorescence, while T. canescens has an 

 inflorescence which is often completely nodding. 

 In contrast, the inflorescence of T. orthochaetum 

 is frequently intermediate, being arched but not 

 completely drooping. Distinguishing features of 

 the seedlings of these species, if any, are 

 unknown. These grasses are members of dense 

 graminoid communities, and careful surveys are 

 necessary to locate and identify them. 



D. Identifying characteristics of material which is 



in interstate or international trade or commerce: 



No interstate or international trade or commerce 

 known. 



