226 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
12. ANULOCAULIS Standley. 
Stout perennial herb; leaves mostly basal, nearly orbicular, lacerate-margined 
or dentate, thick and leathery; stems much branched, glabrous but with viscid rings 
about the internodes; flowers in small clusters, sessile or pedicellate; perianth funnel- 
form, with a long tube; fruit biturbinate, 10-ribbed. 
1. Anulocaulis leiosolenus (Torr.) Standley, Contr. U. 8. Nat. Herb. 12: 375. 
1909. 
Boerhaavia leiosolena Torr. U. 8. & Mex. Bound. Bot. 172. 1859. 
TypE LOCALITY: ‘‘In gypseous soil, Great Cafion of the Rio Grande, 70 miles below 
El Paso,’’ Texas. 
RaNnGaeE: Western Texas and southeastern New Mexico. 
New Mexico: Near Lakewood (Wooton). In gypsum soil, in the Lower Sonoran 
Zone. 
13. BOERHAAVIA L. 
Slender annual or perennial herbs, glabrous or pubescent, often with glandular 
rings about the internodes; leaves opposite, unequal, petiolate or sessile; flowers 
small, variously arranged, each usually subtended by 1 or 2 minute bracts; perianth 
campanulate, 5-lobed; stamens 1 to 5, exserted or included; fruit clavate to obpyram- 
idal, 3 to 5-ribbed or angled, or sometimes with 3 to 5 low thick wings. 
KEY TO THE SPECIES. 
Perennials. 
Leaves linear or narrowly linear-lanceolate........-....--- 1. B. tenuifolia. 
Leaves broadly ovate. 
Flowers solitary, on long slender pedicels. 
Fruit glabrous; flowers about 1 mm. broad........... 4. B. organensis. 
Fruit viscid; flowers 3 to 5 mm. wide............... 5. B. gracillima. 
Flowers short-pediceled, in umbels. 
Stems hirsute below...........-------------6--00-- 2. B. ixodes. 
Stems glabrous or puberulent below............-.. 3. B. viscosa olig- 
adena. 
Annuals, 
Flowers in slender spikes or racemes. 
Ribs of the fruit 4; fruit truncate or very obtuse at the 
apex; bracts large, persistent; stems mostly erect, 
sparingly branched..........------------------- 6. B. wrightii. 
Ribs of the fruit 5; fruit rounded at the apex; bracts 
small, deciduous; stems decumbent or ascending, 
much branched...........---------2-2eeeee ee eee 7. B. torreyana. 
Flowers not spicate or racemose. 
Fruit rounded at the apex, subtended by large reddish 
persistent bracts; plants glandular.............. 8. B. purpurascens. 
Fruit truncate at the apex; bracts minute, green, decidu- 
ous; plants glabrous or nearly so. 
Leaves thick and fleshy, very glaucous, especially 
beneath, oblong; flowers in simple umbels, 
short-pediceled; stems decumbent or ascend- 
INQ.... 0. eee eee eee eee eee 9. B. intermedia. 
Leaves thin, not conspicuously glaucous, paler 
beneath, broadly ovate; flowers in compound 
umbels; stems erect.........------------ eee 10. B. erecta thorn- 
bert. 
