180 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Because of the herbaceous habit, the prominently veined leaflets, and the 
form of the calyx, the proposed species is evidently related to the more south- 
ern H#. leptorhiza. The absence of spines on the fruit is sufficient to distinguish 
the present plant specifically. 
10. Erythrina costaricensis Micheli, Bull. Herb. Boiss. 2: 445. pl. 12. 1894. 
TYPE LOCALITY: River banks near Boruca, Costa Rica. 
DISTRIBUTION: Costa Rica (Cook ¢ Doyle 284; Tonduz 12805, 13926, 10050) ;. 
Panama (Pittier 2287, 2656; Goldman 1854; Mazon 4808; Williams 782). 
The Costa Rican vernacular names are given as “ elekeme,” “ coralillo,” and 
* poro.” 
11. Erythrina lanata Rose, U. 8S. Dept. Agr. N. Amer. Fauna 14: 81. fig. 1. 1899. 
TYPE LOCALITY: Acapulco, Guerrero. 
DISTRIBUTION: Guerrero (Palmer 129, type); Oaxaca (Nelson 2699). 
12. Erythrina occidentalis Standl., sp. nov. 
Shrub or small tree, the branches gray, tomentulose when young, armed with 
numerous short stout spines, or sometimes perhaps unarmed; petioles slender, 
unarmed or bearing 1 or 2 short curved spines; leaflets broadly deltoid or 
rhombic, 5 to 17 em. long, 4 to 12.5 cm. wide, usually truncate at the base,. 
rarely broadly cuneate, very acute to acutish at the apex, thin, bright green 
above, usually somewhat paler beneath, tomentulose when young but soon 
glabrate; racemes dense, elongate; calyx 8 to 10 mm. long, closely white- 
tomentulose, obliquely truncate, the limb obscurely denticulate; standard 
oblong-linear, 5 to 5.5 cm. long, 7 to 8 mm. wide, thinly white-tomentulose ; 
fruit 18 to 28 em. long, 5 to 10-seeded, slightly constricted between the seeds, 
at first densely white-tomentulose but later glabrate; seeds scarlet, about 12° 
mm, long. 
Type in the U. S. National Herbarium, no. 636555, collected along the beach 
at Mazatliin, Sinaloa, Mexico, March 30, 1910, by J. N. Rose, P. C. Standley, 
and P. G. Russell (no. 18725). 
ADDITIONAL SPECIMENS EXAMINED: 
SINALOA: Rosario, July, 1897, Rose 1822, 1592. Near Colomas, July, 1897,. 
Rose 1796. Guadalupe, April, 1910, Rose, Standley & Russell 14732. 
Culiacin, October 30, 1904, Brandegee. La Rastra, March, 1899, 
Goldman 365. 
Trptic: Marfa Madre Island, May, 1897, Maltby 127, Nelson 4303. 
The plant is leafless at time of flowering, and none of the specimens cited 
show both flowers and leaves. Probably; however, all are referred here cor- 
rectly, though some were referred by Rose to H#. lanata at the time of pub- 
lication of that species. The present plant is most closely related to H. lanata, 
but differs in its smaller standard, this with a much less dense indument, its. 
larger seeds, and its less constricted pod. 
13. Erythrina herbacea L. Sp. Pl. 706. 1753. 
Type LOcALITY: Carolina. 
DISTRIBUTION: Tamaulipas (Palmer 130, 328, 119, 544; Pringle 7687); San 
Luis Potosi (Palmer 219; Pringle 5123; Rose é Hough 4869). Also northward 
and eastward along the Gulf and Atlantic coasts to North Carolina. 
So far as the writer knows, H#. herbacea has not been reported previously 
from Mexico. All the Mexican specimens appear to have been taken from 
shrubs, although in many parts of its range the species is truly herbaceous, 
the stems dying to the ground each year. The shrubby Florida form has been 
