STANDLEY—ALLIONIACEAE OF THE UNITED STATES. 375 
distinct tube instead of being campanulate, and the 10-ribbed fruit of different 
shape. 
Doctor Heimerl® placed Boerhaavia leiosolena and B. eriosolena in a sep- 
arate section of the genus, which he named Solenanthae. He remarks that 
these two plants differ very much from the other species of the genus, but he 
did not see fit to separate them more definitely. 
Type species, Boerhaavia eriosolena A. Gray. 
KEY TO THE SPECIES, 
Fruit obconical in outline, depressed above____-____-________ 1. A. eriosolenus. 
Fruit biturbinate. 
Flowers 5 to 9 mm. long; leaves conspicuously glandular- 
dotted ~~~ ~~~ ee 2. A. annulatus. 
Flowers 20 mm, long; leaves not glandular-dotted______ 3. A. leiosolenus. 
S; : 
1. Anulocaulis eriosolenus (A. Gray) Standley. 
Boerhaavia eriosolena A. Gray, Am. Journ. Sci. Il. 15: 322. 1853, 
Specimens examined: 
Mexico: Azufrora near Saltillo, 1848, Gregg 512, type collection; Viesca, 
Coahuila, 1905, Purpus 1053; Torreon, Coahuila, 1908, Purpus. 
Texas: Bluffs of the Rio Grande, 1883, Havard 58; Mexican Boundary 
Survey 1138. 
2. Anulocaulis annulatus (Coville) Standley. 
Boerhaavia annulata Coville, Contr. Nat. Herb. 4: 177. 1893, 
Specimens examined: 
CALIFORNIA: Furnace Creek Canyon, Funeral Mountains, 1891, Coville & 
-——— 
Funston S77, type; Panamint Canyon, 1897, Jones. 
38. Anulocaulis leiosolenus (Torr.) Standley. 
Boerhaavia leiosolena Torr. Bot. Mex, Bound, 172. 185s. 
Specimens examined: 
TeExAS: Mexican Boundary Survey 1139, type collection ; Dallas Creek, 1881, 
Havard; Tornillo Creek, 1883, Havard. 
NEVADA: Muddy Creek, 1898, Purpus 6155. 
15. BOERHAAVIA L. 
-—« 
Boerhaavia L. Sp. Pl. 38. 1753. 
Annual or perennial herbs, slender, glabrous or pubescent, often with 
glandular rings about the internodes; leaves opposite, the blades unequal, entire, 
petioled or sessile; flowers small, variously arranged, each usually subtended by 
1 or 2 minute bracts, on jointed pedicels; perianth campanulate, 5-lobed ; stamens 
1 to 5, exserted or included, with very slender filaments which are united at 
the base; fruit club-shaped to obpyramidal, 3 to 5-ribbed, 3 to 5-angled, or 
sometimes with 3 to 5 low, thick, not membranous wings, 
Type species, Boerhaavia erecta L. 
The genus has probably a wider distribution than any other of the genera of 
the Allioniaceae. It includes about fifty species besides those mentioned here. 
They occur through the southern part of the United States, through Mexico, the 
West Indies, a large part of South America, and the islands of the Pacific, in- 
cluding Australia, and through southern and eastern Asia, Africa, and Spain. 
@Engler & Prantl, Pflanzenfam, 3'°; 26, 1889, 
