426 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



20. Boerhaavia triquetra S. Wats. Proc. Amer. Acad. 24: 69. 1889. 



Type locality, "Sandy plains and stony ridges near Los Angeles Bay," Baja Cali- 

 fornia. Type collected by Dr. Edward Palmer in 1887 (no. 521). 

 Specimens examined: 



Baja California: Type; also Palmer's 603 collected in the same locality during 

 the same season. 



21. Boerhaavia maculata Standley, Contr. Nat. Herb. 12: 379. 1909, 



Type locality, "Guaymas, Sonora." Type collected by Dr. Edward Palmer in 

 1887 (no. 332, in part). 



Specimens examined: 



Sonora: Type. 



Sinaloa: Topolobampo, September, 1897, Palmer 208; dry rocky cliffs along the 

 s ea near Topolobampo, March 23, 1910, Rose, Standley & Russell 13324. 



One of the most noticeable peculiarities of this species is the very long pedicels of 

 some of the flowers, the longest becoming 10 mm. long or even more; the uppermost 

 flowers of the corymb have shorter pedicels. The flowers, too, are very large for the 

 genus; in the specimens collected by the writer at Topolobampo they were 6 or 7 mm. 

 in diameter, of a delicate pink color. They were open late in the forenoon and were 

 rather conspicuous upon the cliffs where plant life was not abundant. Only a few 

 plants were observed and they probably were brought into flower so early because of 

 the water dashed up from the sea upon the cliffs. 



22. Boerhaavia lateriflora Standley, sp. nov. 



An erect or spreading annual, much branched; stems slender, finely puberulent; 

 leaf blades broadly lanceolate to oblong, glabrous, thin, of about the same color on both 

 surfaces, acute to obtuse at the apex, rounded at the base, all on slender petioles one- 

 third to half as long as the blade; inflorescence loosely paniculate, the earlier inflores- 

 cence consisting of peduncled, axillary umbels; flowers in many-flowered umbels, 

 equally pedicellate; perianth white, 2 mm. long or more; stamens barely exserted; 

 anthocarp clavate, 5-angled, 3 mm. long or less. 



Type in the U. S. National Herbarium, no. 22945, collected at Guaymas, Sonora, 

 in 1887, by Dr. Edward Palmer (no. 680). The station which has added so many 

 species of Boerhaavia to our flora yields yet another. This one is nearest B. intermedia 

 but differs in its thinner,usually more acute leaf blades which are not strongly glaucous 

 beneath, and in its large white perianth. One of the most noticeable characteristics 

 of the plant is the large number of long-peduncled umbels borne in the axils of the 

 lower leaves, whence the specific name. 



Other specimens were collected at Guaymas in 1887 by Doctor Palmer under num- 

 bers 678, 682, 684, 685, 686, and 687. 



23. Boerhaavia erecta L. Sp. PI. 3. 1753. 

 Boerhaavia virgata II. B. K. Nov. Gen. & Sp. 2: 215. 1817. 

 Valeriana latifolia Mart. & Gal. Bull. Acad. Sci. Brux. II 1 : 124. 1844. 

 Boerhaavia paniculata subacuta Choisy in DC. Prodr. 13 2 : 451. 1849. 

 Type locality, "In Vera Cruce," Mexico. 

 Specimens examined: 



Sonora: Guaymas, 1887, Palmer 182. 



Sinaloa: Culiacan, 1891, Palmer 1505; old field east of Mazatlan, April 7, 1910, 

 Rose, Standley & Russell 14160; sandhills near Rot-ario, April 15, 1910,' Rose 

 Standley & Russell 14630; Rosario, July 24, 1897, Rose; Culiacan,' 1904^ 

 Brandegee; Rosario, July, 1897, Rose 1827, 1844; between Rosario and Colomaa' 

 July 12, 1897, Rose 1605. 

 Tepic: Arroyo south of Acaponeta, April 9, 1910, Rose, Standley <t- Russell 14251; 

 Acaponeta, June 29, 1897, Rose 1498. 



