1910] Pease & Moore,— Agropyron caninum and Allies 69 
KEY TO THE VARIETIES AND FORMS: 
a. Awns mostly under 1.5 cm. long, or none. b. 
b. Awns mostly 7-15 mm. long. c. 
c. Plants glabrous . . PL. Deu ub uie: canum 
c. Some or all of the leaves or sheaths hairy. d. 
d. Plants not glaucous . . . . . 2. A. caninum f. pubescens 
d. Plants glaucous . . . . 3. A. caninum f. glaucum 
b. Awns none, or not exceeding 6 mm. e. 
e. Spikes generally long and slender (average length about 12-14 em.): 
usually lowland plants. f. 
f. Plants glabrous . . 4. A.caninum var. tenerum. 
f. Leaves, sheaths, or both prov ided with hairs. g. 
g. Plants not glaucous . 5. A.caninum var. tenerum f. ciliatum. 
g. Leaves and sheaths glaucous. 
6. A. caninum var. tenerum f. Fernaldii 
e. Spikes generally short and thick (average length about 7-8 em.): 
usually alpine or far northern. h. 
h. Glumes with a fine pubescence. 7. A. caninum var. latiglume. 
h. Glumes minutely ciliate on the margins, not pubescent. i. 
i. Leaves glabrous . . . . 8. A. caninum var. Hornemanni. 
i. Leaves pilose above. 
9. A. caninum var. Hornemanni f. pilosifolium. 
a. Awns mostly 1.5 em. long or over 
j Spikes short and thick, average length (exclusive of terminal awns) 
5-7 em. k. 
k. Awns ascending, not strongly recurved. 
10. A. caninum var. andinum. 
k. Awns strongly recurved (often bent out nearly at right angles). 1. 
l. Plants glabrous. ll. A. caninum var. Gmelini. 
l. Leaves (rarely sheaths also) provided with hairs. 
A. caninum var. Gmelini f. Pringlei. 
j. Spikes (inclusive of awns 2) 7.2-20 em. long. m. 
m. Plants glabrous . . - 13. A. caninum var. unilaterale. 
m. Sheaths and often leaves provided with hairs. 
14. A. caninum var. unilaterale f. ciliatum. 
l. AGROPYRON CANINUM (L.) Beauv. Spikes long and slender, 
7.2-21.6 em. long (exclusive of the terminal awns), 3-10 mm. wide 
(exclusive of the awns); awns 5-25 mm. (mostly 7-15 mm.) long,’ 
generally spreading, not rarely ascending — giving the spike é 
unilateral appearance).— Agrost. 102, 146 (1812): — R. & S. 
Syst. Veg. ii, 756 (1817); Reichenb. Ic. Flor. Germ. Helv. i, 29, t. 19, 
fig. 1381 (1850); ;* Scribn. & Sm. U. S. Dept. Agr. Div. Agrost. Bull. 
no. 4, 29 (Feb. 6, 1897). 
Gramen caninum non repens elatius spica aristata Moris. Pl. Hist. 
1 Any key to this group would fit only the more typical cases, because of the intergrada- 
tion. 
? The awns are included because their ascending or approximate character makes them 
an integral part of the spike. 
3 If the low measurements (5-6 mm.) hold throughout a spike, the specimen will be 
better treated as no. 4. 
1 Color of the awns purplish. 
