65 
2. Panicle contracted. 
. M. distichophylla Kth. 
. M. Emersleyi Vasey. 
. M. setifolia Vasey. 
. M. Berlandieri Trin. 
Ions 
3. Panicle linear, or much contracted. 
8. IM. acuminata Vasey. 
9, IM. virescens Trin. 
10. JM. gracilis Trin. 
B. Culms mostly low and slender, and with a decumbent base, panicle spreading. 
11. JM. arenicola Buckl. 
12. IM. gracillima Torr. 
13. M. pungens Thurb. 
C. Culms erect, simple or branching, panicle close or spike-like. 
14. ‘M. comata Thurb. 
15. IM. glomerata Trin. 
16, Wrightii Vasey. 
D. Culms weakly erect or decumbent, simple or branched. 
17. M. Willdenovii Trin. 
18. IM. diffusa Schreb. 
E. Culms ascending, panicle contracted, from scanty rootstocks. 
19. IM. sobolifera Trin. 
20. IM. Mexicana Trin. 
21. (M. Californica Vasey. 
22. M. Parishii Vasey. 
23. M. Huachucana Vasey. 
24. IM. sylvatica T. & G. 
25. IM. ambigua Torr. 
I’. Low plants, culms erect, branching, panicle spreading. 
26. M. Buckleyana Scribn. 
27. ‘M. Arizonica Scribn. 
28. M. debilis Trin. 
29. M. Texana Thurb. 
H, culms branching, wiry, panicle contracted. 
30. IM. Neo-Mexicana Vasey. 
31. M. pauciflora Buckl. 
32. M. Lemmoni Scribn. 
33. IM. Pringlei Scribn. 
34. IM. monticola Buckl. 
35. IM. parviglumis Vasey, 
Anomalous: 
36. IM. dumosa Scribn. 
37. IM. depauperata Scribn. 
1. Muhlenbergia capillaris Kth. (Stipa diffusa Walt. ; Stipa sericea Michx.; Stipa 
capillaris Lan.; Agrostis setosa Willd.; Agrostis sericea Ell.; Podosemum capillare Desv.; 
Trichochloa capillaris DC.) (Gray’s Manual, 6th ed., p. 644.) Culms 2 to 4 feet high, 
12974—No. 1_5_ [Feb. 25, 1892., 
