98 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
shorter than the lemma, 2-keeled; stamens 3; styles distinct; grain narrow, oblong, 
free. 
1. Dactylis glomerata L. Sp. Pl. 71. 1753. 
Type Loca.ity: ‘‘Habitat in Europae cultis ruderatis.”’ 
Rance: Widely distributed in North America, introduced from Europe and often 
cultivated. 
New Mexico: Shiprock; Cedar Hill; Chama; Winsors Ranch; Mesilla Valley. 
65. DISTICHLIS Raf. Sa.rarass. 
Rigid erect stoloniferous perennial with dense panicles of rather few compressed 
spikelets; spikelets 8 to 16-flowered, dicecious; glumes carinate, acute, shorter than 
the lemmas; lemmas broader, 3 to many-nerved, acute, rigid; palea 2-keeled, equal- 
ing or shorter than the lemmas; stamens in the staminate flower 3; styles thickened 
at the base, rather long, distinct; grain closely enveloped in the thickened and cori- 
aceous base of the palea. 
1. Distichlis spicata (L.) Greene, Bull. Calif. Acad. 2: 415. 1887. 
Uniola spicata L. Sp. Pl. 71. 1753. 
Tyre LocaLity: ‘‘Habitat in Americae borealis maritimis.”’ 
Rance: Throughout the United States and in Mexico. 
New Mexico: Farmington; Dulce; E] Rito; Algodones; Las Palomas; Nambe Val- 
ley; near Cliff; Rincon; White Sands; Mesilla Valley. Saline soil, in the Lower 
and Upper Sonoran zones. 
66. POA L. BLuearass. 
Annuals or perennials with usually flat leaves and with a paniculate inflorescence; 
spikelets 2 to 6-flowered, the uppermost floret rudimentary; rachilla jointed above 
the glumes, these herbaceous, lanceolate or ovate, 1 to 3-nerved, keeled, persistent; 
lemmas herbaceous or membranaceous, lanceolate or ovate, acute or obtuse, awnless, 
5-nerved, carinate, falling with the 2-keeled palea and a joint of the rachilla, the 
dorsal or marginal nerves usually soft-hairy and often with a tuft of cobwebby hairs 
at the base; stamens 3; styles distinct. 
KEY TO THE SPECIES, 
Annuals, 
Plants low, 10 to 20 cm. high; branches of the panicle 
spreading wee eee eee eee eee eee eee eee eee eee 1, P. annua. 
Plants taller, 15 to 50 cm. high; branches of the panicle 
CTECE.. 2.2.2 eee eee eee eee cee cece eee e ee eee 2. P. bigelovit 
Perennials. 
Cobweb at the base of the flowers wanting; spikelets acute 
at the base; lemmas 5 mm. long or more. 
Spikelets only slightly compressed; lemmas rounded 
at the apex. 
Lemmas merely slightly scabrous; plants bright 
green........... 2.22 eee eee eee eee ll. P. laevigata. 
Lemmas strigose below, scabrous above; plants 
yellowish green............-...... .-12. P. lucida. 
Spikelets strongly com pressed; lemmas acute. 
Ligules long, 5 to 7 mm., acute or acuminate. .13. P. longiligula. 
Ligules short, less than 5 mm. long, rounded or 
truncate at the apex. 
Panicles very narrow and contracted, long- 
peduncled........... cece ence ee eeeee 14. P. longipedunculata. 
