388 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Salvador: 1905, Renson 241 



Mexico: Near Llano Grande, Providencia, Chiapas, December 13, 1906, Collins 

 & Doyle 72. 

 The plant is raid to be a small thorny tree with greenish flowers. It differs from 

 P. aculeata in its much larger fruit and usually straight spines. The leaves, too, are 

 more narrowed at the base and the petioles more or less margined. The branches are 

 a deep reddish brown, while in P. aculeata they are usually much paler or even gray- 

 ish. P. pediccllaris was based upon Cuban specimens; the species is found in Jamaica 

 as well. Some of the Cuban specimens have the spines curved, but the Central 

 American specimens seem to have them uniformly straight. 



3. Piaonia fasciculata Standley, sp. nov. 



Branches reddish or yellowish, smooth and glabrous, armed with few rather stout, 

 straight spines 3 or 4 mm. long; leaf blades elliptic, acute, 35 to 40 mm. long, taper, 

 ing at the base to closely puberulent petioles 4 or 5 mm. long; staminate flowers in 

 5 to 10-flowcred clusters, subumbellate, the cluster 1 cm. or less in diameter, on a 

 slender, viscid peduncle 12 mm. long, 2 to 5 clusters in an axil; perianth 2 to 3 mm. 

 long, narrowly campanulate, minutely glandular-puberulent, almost sessile; stamens 

 5, exserted 2 or 3 mm.; pistillate flowers and fruit not seen. 



Type in the U. S. National Herbarium, no. 45190, collected in Nicaragua by Charles 

 Wright, 1853 to 1856. There is a sheet of the same collection in the Gray Herbarium. 



The subcapitate inflorescence and the occurrence of more than one peduncle at a 

 node readily distinguish this species. 



A specimen in the Gray Herbarium collected at Gualan, Guatemala, at an altitude 

 of 125 meters, January 15, 1905, Deam 270, seems to be the same. This specimen 

 has no spines and the flowers are more nearly sessile. The collector says that it is 

 a tree 15 feet high. 



4. Pisonia capitata (S. Wats.) Standley. Plate 75, B. 

 Cryptocarpus ? capitatus S. Wats. Proc. Amor. Acad. 24: 71. 1889. 



Type locality, "Near Guaymas," Sonora. 



A low, densely branched shrub or small tree, 5 meters high or less, the branches 

 often weak and clambering or spreading, armed with numerous stout, curved, or 

 rarely straight spines 7 to 14 mm. long; older branches glabrous, grayish or yellowish, 

 the younger ones densely pubescent; leaf blades orbicular to obovate, 20 to 60 mm. 

 long, broadly rounded at the apex, rounded or tapering at the base, yellowish green, 

 on petioles 6 to 16 mm. long; staminate flowers wine red, very fragrant, in dense 

 corymbs 10 to 18 mm. in diameter, these not at all dissected but compact; staminate 

 perianth 2 to 3 mm. long, with 5 obtuse lobes, densely viscid without; stamens 5, 

 exserted 2 or 2.5 mm., the anthers conspicuous, buff; pistillate flowers in loose corymbs 

 10 to 18 mm. broad on peduncles 18 to 20 mm. long, tubular, reddish, densely viscid; 

 style exserted about 1 mm., the stigma fimbriate; anthocarp prismatic, about 10 mm. 

 long, rounded at the apex, narrowed near the base, the angles each with a single row 

 of glands, the sides puberulent, the fruits arranged in a loose corymb 6 cm. or less in 

 diameter, the branches viscid-pubescent. 

 Specimens examined: 



Sonora: Guaymas, February 17, 1890, Palmer 175; Alamos, January 26, 1899, 

 Goldman 298; Guaymas, April 1 and 2, 1891, Palmer 1759; near Navojoa, 

 March 21, 1910, Rose, Standley & Russell 13144; near Los Ranchos, vicinity 

 of Guaymas, April 23, 1910, Rose, Standley & Russell 15032; along an arroyo 

 in hills beyond the railroad station, Alamos, March 16, 1910, Rose, Standley 

 & Russell 12924; Guaymas, 1887, Palmer 647, type; Guaymas, June, 1897, 

 Rose 1264. 

 Sinaloa: Road from Culiacan to Las Flechas, February 21, 1899, Goldman 314; 

 near Bacubirito, March 12, 1904, Wm. Palmer 1250; along an arroyo near San 



