406 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



the uppermost with distinct although short petioles; inflorescence corymbosely much 

 branched; involucres very numerous, short-pediceled, 4 mm. high or less, 1-flowered, 

 rather densely hispidulous; fruit glabrous, almost 3 mm. long, irregularly rugulose. 



Type in the U. S. National Herbarium, no. 470249, collected in rocky soil near 

 Ixmiquilpan, Hidalgo, July, 1903, by C. A. Purpus (no. 429). 

 Additional specimens examined: 



Queretaro: Between El Ciervoand San Juan, August 29, 1905, Altamirano 1769. 



Related to A. corymbosa but differing in its more numerous and smaller involucres 

 and narrower leaves. 



10. Allionia corymbosa (Cav.) Kuntze, Rev. Gen. PI. 533. 1891. 

 Mirabilis corymbosa Cav. Icon. PI. 4: 55. pi. 879. 1797. 

 Calyxhymenia glabrifolia Orteg. Hort, Matr. Dec. 6: pi. la. 1797. 

 Calymenia corymbosa Pers. Syn. PI. 1: 37. 1805. 



Oxybaphus glabrifolius Vahl. Enum. PL 2: 40. 1806. 

 Type locality, "Habitat in Nova Hispania." 

 Specimens examined: 



Hidalgo: Near El Sal to, September 16, 1903, Rose & Painter 7100; on Sierra de 



la Mesa, 1905, Rose, Painter & Rose 9102. 

 Coahuila: Vicinity of Saltillo, June, 1898, Palmer 326. 

 San Luis Potosi: Vicinity of San Luis Potosf, 1878, Parry & Palmer 769; same 



locality, 1898, Palmer 644; San Luis Potosf, 1879, Schaffner 468. 

 Aguascalientes: Near Aguascalientes, October 9, 1903, Rose & Painter 7732. 

 Coahuila or Nuevo Leon: 1880, Palmer 1112. 



11. Allionia glabra recedens (Weatherby) Standley. 



Oxybaphus glaber recedens Weatherby, Proc. Amer. Acad. 45: 425. 1910. 



Type locality, "Chihuahua: between Casas Grandes and Sabinal." Type collected 

 by E. W. Nelson (no. 6351), September 4-5, 1899, at an altitude of 1,550 to 1,700 

 meters. 



Only the type collection has been examined from Mexico. 



This well-marked form is found in New Mexico and Texas in the Rio Grande Valley, 

 in the Pecos Valley of New Mexico, in various parts of western Texas, and in south- 

 western Kansas. It seems probable that the specimens collected by Pringle on sand 

 hills near Paso del Norte, Chihuahua, in 1886 (no. 1126), belong here as well, although 

 I have not seen the specimens since the publication of the subspecies. The involucres 

 of the form are often 2-flowered, and in the National Herbarium is a specimen to which 

 Dr. Heimerl gave the name bifiora on this account. Very often, although not always, 

 the flowers are cleistogamous. The species proper seems to be restricted to south- 

 eastern Utah and northeastern Arizona. 



12. Allionia gausapoides Standley, sp. nov. 



Stems slender, about a meter high, glabrate below, densely pilose- viscid above; 

 leaf blades sessile, 6 cm. long or less, linear or narrowly linear-lanceolate, tapering at 

 both ends, obtuse, thick and fleshy, somewhat glaucous, pilose throughout when 

 young, ciliate at maturity; inflorescence loosely and openly cymose, with densely 

 pilose-viscid branches; involucres few, clustered at the ends of the branches, 6 or 7 

 mm. high, densely pilose-viscid, the long pubescence black or tawny, the lobes ovate, 

 acute, half as long as the involucre; flowers 3, the perianth 10 to 12 mm. long, glabrous; 

 anthocarp ellipsoidal, constricted near the base, acute, 4 to 5 mm. long, glabrous, the 

 ribs narrow and smooth, the intercostal spaces coarsely rugulose. 



Type in the U. S. National Herbarium, no. 22688, collected in the region of San 

 Luis Potosf, in 1878, by Pa::ry & Palmer (no. 768). A plant unique in its combination 

 of narrow leaves, glabrous fruit, and densely pilose stem and involucres. 



13. Allionia divaricata Rydb. Bull. Torrey Club 29: 691. 1902. 

 Type locality, "Durango," Colorado. 



Specimens examined: 



Durango: Durango, 1896, Palmer 925; Durango, 1898, Nelson 4621. 



