6 Rhodora \ [JANUARY 
Panicle-branches smooth or nearly so: lemmas 2.3-2.8 m 
long, firm in texture Pe? ee SES Ses, 
Panicle-branches strongly ated Veo thin in texture. 
Lemmas 2.5-3 mm. grain 1.4-1.6 mm. long. 
macra. 
Lemmas 2 mm. long or less: grain 1-1.2 mm. long. 
9. P. airoides. 
LD. > Laminns eeepually entire. 00.5.4. ...5.2-.411.  P: paupercula. 
B. Grain 1.8—2.5 mm. lon 
Flowering make sont: leaves 2.5-6 mm. wide: lower panicle- 
branches densely floriferous nearly to the base: midrib of 
the coriaceous lemma prolonged to the apex, often excurrent 
as a short mucro......... ..4. P. rupestris. 
Flowering sohns. dendints: ‘nneek 0. ae mm. wide: lower 
panicle-branches floriferous chiefly above ik middle: lemma 
with hyaline margin; its midrib not excurre G. 
Glumes and lemmas serrulate and oe er under 
a lens. 
Gray-green: panicle-branches ascending or spreading, 
not nen smooth or nearly so: lemmas 2.3- 
2.8 mm. long. . Ae Bg as earundiand. 
Bright- pete padicbbruncher < “bhisth reflexed, sca- 
brous: lemmas thin and lustrous, 3-4 mm. lon 
10 
fe 
P. lucida. 
G. spe essentially entire, not eee 
as 2~4 mm. long, tapering to a blunt point or obtus- 
7 ae ecg glume 2-3 he long: panicle 0.2-1.8 
lon 
Lemmas 22. 5 mm. long: panicle 1-6 em. long. 
11. upercula, 
Lemmas 3-4 mm. long: panicle 0.3-1. 8 dm. long. 
(11.) P. paupercula, var. alaskana. 
Lemmas 4.5-6 mm. long, acute or acuminate: second 
glume 7-9 mm. long: panicle 1-2.5 dm. long. 
(11.) P. paupercula, var. longiglumis. 
* Anther 1.5-2.2 mm. long: perennials, often stoloniferous late in the 
season (usually after anthesis). 
P. maritma (Huds.) Parl. Fras. 1-6. Coarse; the smooth 
tres 2-8 dm. high, forming dense clumps: leaves pale, firm, usually 
involute in age, 0.25-1.7 dm. long; ligule 1-3 mm. long, entire, blunt- 
pointed: panicle 0.45-2.7 dm. long, usually somewhat exserted; the 
ascending or finally spreading, but not reflexed, branches and the 
icels scabrous: spikelets 0.5-1.2 cm. long, 4-11-flowered: Ist 
glume 2.2-3.4 mm. long, 3-nerved, acute; 2d pl ovate, 3-4.5 mm. 
long, 3-nerved, tapering abruptly to a short apex: lemma 4-5 mm. 
