WOOTON AND STANDLEY—FLORA OF NEW 
Panicles open, broad, on long or short pe- 
duncles. 
Panicles very short, 5 cm. or less; 
plants less than 30 cm. high; 
leaves smooth beneath, scabrous 
above........... ..15. 
Panicles longer, 8 to 15 cm.; plants 30 
to 60 cm. high; leaves variously 
pubescent. 
Glumes nearly equal, 3-nerved; 
leaves smooth beneath, sca- 
brous above.........---+--. 16. 
Glumes unequal, the first 1-nerved, 
the second 3-nerved; leaves 
scabrous beneath, hispid- 
puberulent above.......--.-. 17. 
Cobweb present at the base of the flowers, though some- 
times scanty; lemmas acute (except in P. com- 
pressa) and usually strongly keeled; plants with 
horizontal rootstocks; spikelets. and lemmas 
various. 
Intermediate nerves of the lemmas faint or obsolete. 
Stems compressed; panicles narrow, open.......- 8. 
Stems not compressed; panicles various. 
Branches of the panicles reflexed.......... 9. 
Branches of the panicles not reflexed....... 10. 
Intermediate nerves of the lemmas conspicuous. 
Panicles with numerous many-flowered spikelets, 
the branches in fruit ascending (the lower 
ones in 3’s and 4’s); lemmas acutish...... 3. 
Panicles usually with few-flowered spikelets, the 
branches reflexed or spreading in fruit; 
lemmas very acute. 
Spikelets few, usually purplish; branches of 
the panicle few, solitary or in pairs. 
Intermediate nerves of the lemmas 
long-hairy.........---..-----+++-- 4. 
Intermediate nerves of the lemmas gla- 
brous, the hairs on the principal 
nerves copious and spreading.... 5. 
Spikelets numerous, green; branches of the 
panicle numerous, the lower ones 
often in 3’s and 4’s. 
Lemmas only slightly pubescent on the 
keel below.....-....... 6. 
Lemmas copiously white-pubescent on 
the back below, villous on the 
marginal nerves and keel........ 7. 
1. Poa annua L. Sp. Pl. 68. 1753. 
Type tocauty: “ Habitat in Europa ad vias.” 
MEXICO, 99 
P. brevipaniculata. 
P. arida. 
P. fendleriana. 
P. compressa. 
. aperta. 
. interior. 
mh 
P. pratensis. 
P. arctica. 
P. reflexa. 
P. occidentalis. 
P. tracyi. 
Low SPEARGRASS. 
Rance: Nearly throughout the United States; also in Europe and Asia. 
New Mexico: Santa Fe; Ponchuelo Creek. Moist soil, in the Upper Sonoran and 
Transition zones. 
