STANDLEY ALLIONIACEAE OF MEXICO. 389 



Bias, March 22, 1910, Rose, Standlcy & Russell 13213; thickets near Villa 

 Union, April 2, 1910, Rose, Standky & Russell 13896; thickets east of Mazat- 

 lan, April 1, 1910, Rose, Standky & Russell 13847; dry thickets near Rosario, 

 April 14, 1910, Rose, Standlcy & Russell 14519; Mazatlan, 1902, Purpus; 

 Rosario, June 20, 1897, Rose 1407. 

 Tepic: Moist arroyo near Acaponeta, April 10, 1910, Rose, Standley & Russell 

 14317. 

 The most striking difference between this species and Pisonia aculeata, at least in 

 the field, is the very different color of the flowers; those of that species are yellowish 

 green, while those of Pisonia capitata are a deep red. The latter is a very handsome 

 shrub, at least as to the staminate plant, while the flowers of P. aculeata are incon- 

 spicuous and scarcely noticeable against the leaves. The leaves of the two are different 

 as well, those of aculeata being usually smooth, rather fleshy, and shining, while those 

 of capitata are pubescent, of a yellowish green cast, not at all fleshy, and never shining. 

 The two are somewhat different in habit as well. 



The writer in the spring of 1910 visited the type locality of the species near Guaymas. 

 This is the northern limit of its range and only a few individuals were to be seen. 

 These were stunted and not typical of the species. They were growing in a sandy 

 arroyo not far from the coast at Los Ranchos about 5 or 6 miles from Guaymas. Farther 

 south the plant was observed in abundance. It was frequent in the hedges about 

 towns, along arroyos, and in the dense thickets so characteristic of the vegetation of 

 the west coast of Mexico. At Alamos the common name was given as garrambullo, and 

 the fruits were said to be used to make a decoction for treatment of fever. 

 The photograph was taken at Alamos, Sonora, by E. A. Goldman. 



5. Pisonia flavescens Standley, sp. nov. 



Older branches dark gray, smooth, the younger ones brown or grayish; spines few, 

 stout, straight, 6 to 7 mm. long; leaf blades oblanceolate, 40 to 65 mm. long, obtuse 

 or usually acutish, attenuate to the base, almost glabrous, traces of pubescence some- 

 times persisting along the veins, yellowish green, on slender petioles half as long as 

 the blades; staminate flowers in dense capitate corymbs 10 mm. in diameter or less, 

 these on peduncles less than 10 mm. long and somewhat puberulent; perianth broadly 

 campanulate, the diameter greater than the length, obtusely lobed, sparingly puberu- 

 lous, not glandular; pistillate flowers not seen; anthocarp 10 mm. long, 5-angled, 

 almost glabrous, each angle beset with a row of low and inconspicuous glands. 



Type in the Herbarium of the University of California, no. 101930, collected at San 

 Jose del Cabo, Baja California, in May, 1897, by Mr. T. S. Brandegee. This specimen 

 consists of both flowering and fruiting branches. On the same sheet are flowering 

 branches gathered by the same collector at the same locality in March, 1892. There 

 is a sheet of the type collection in the herbarium of the New York Botanical Garden 

 and a fragment in the National Herbarium. A fragment of the second collection is 

 also to be found in the National Herbarium. 



The proposed species is nearest Pisonia capitata but differs in its oblanceolate, 

 acutish leaves and the much smaller heads of staminate flowers. 



6. Pisonia aculeata L. Sp. PI. 1026. 1753. 

 Pallavia aculeata Veil. Fl. Flum. 151. 1825. 



Tragularia horrida Koen.; Roxb. Fl. Ind. 2: 217. 1832, as synonyn 

 Pisonia monotaxadenia Wright & Sauv. Fl. Cub. 137. 1873. 

 Type locality, " In America meridional!. " 

 Specimens examined: 



Yucatan: 1896, Valdez 57; 1895, Millspaugh 305; Uxmal, Caec. & Ed. SelerBSSV, 



Merida, 1865, Schott 143. 

 Tabasco: Comun en los bosques del camino de San Juan Bautista a Atasta, 

 March 14, 1888, Rovirosa 127. 



