48 Proceedings of the Biological Society of Washington. 



sometimes fertile, oblong, compressed, 2-nerved and 3.5 to 5.5 mm. long, 



3 mm. wide, in which case the terminal joint is dwarfed, with an ovoid 

 body only 2 mm. long, and its seed aborted; terminal joint usually well 

 developed, ovoid-oval, 4 to 4.5 mm. long, 3 to 3.5 mm. wide, compressed, 

 1-nerved and loosely prominulous-reticulate on the sides, 3-nerved on the 

 back, evenly appressed-pilosulous like the beak, the latter stout, com- 

 pressed, hooked, 3 mm. long. 



Type in the U. S. National Herbarium, no. 316713, collected in moist 

 gravelly soil of hills near Oaxaca City, Oaxaca, Mexico, altitude 1675 

 meters, July 3, 1897, by C. G. Pringle (no. 6721). 



Stylosanthes macrocarpa is most nearly related to S. mexicana Taubert, 1 

 but may easily be distinguished by its much larger evenly pilosulous pod. 

 The type collection was distributed as 5. humilis H. B. K., which belongs 

 to a different section of the genus. 



5. mexicana was originally based on Schaffner's no. 579, from San 

 Luis Potosi, and a plant collected by Ehrenberg at an unknown locality; 

 the former of these is here selected as the type. The range of this species 

 may be extended to include the States of Tamaulipas, where it was col- 

 lected at Victoria in 1907, by E. Palmer (no. 490), and Hidalgo, where 

 it was collected in calcareous soil near El Salto, altitude 2135 meters, 

 June 29, 1904, by C. G. Pringle (no. 11969). 



Stylosanthes tuberculata, sp. nov. 



Frutescent below, branched, 3 dm. long and more; stem and branches 

 evenly and rather densely pilose with ascending or somewhat spreading 

 hairs, and less densely hispidulous with ascending hairs with persistent 

 tuberculate bases; leaves mostly shorter than the internodes, 3-foliolate, 

 often with fascicles in their axils; sheaths of the stipules 5 to 7 mm. long, 

 pubescent and hispidulous like the stem, the teeth subulate, 2 to 3 mm. 

 long; petioles similarly pubescent, 2.5 to 4 mm. long, the rachis about 

 1 mm. long; leaflets slightly petiolulate, elliptic or narrowly obovate- 

 elliptic, 6 to 17 mm. long, 2 to 4 mm. wide, mucronulate, rounded at base, 

 slightly denticulate nearly throughout with tuberculate-hispidulous teeth, 

 sparsely appressed- or ascending-pilosulous and tuberculate-hispidulous 

 on both sides, the 4 to 6 pairs of lateral veins prominulous beneath, not 

 forming a submarginal nerve; spikes narrowly oblong, axillary and ter- 

 minal, 7 to 12 mm. long, about 7-flowered; primary bracts unifoliolate, 

 otherwise similar to the leaves, somewhat pilosulous, ciliate, densely 

 tuberculate-hispidulous and hispid with ascending hairs, the sheath about 



4 mm. long, the teeth 3.5 mm., the petiolulate elliptic blade 6 mm. or 

 less; secondary bract 1, oblong-ovate, bifid or entire, obtusish, ciliate 

 above, 3.3 mm. long; axis rudiment subulate, pilose, 1.2 mm. long in 

 flower, 3 mm. in fruit; bractlets 2, linear, obtuse to acute, sparsely ciliate 

 to glabrous, 2.6 mm. long; calyx 7.2 mm. long (including the glabrous 

 4.5 mm. long stipe-like base), the lobes all blunt and merely short-ciliate ; 



» Verh. Bot. Ver. Brandenb 32: 21. 1890. 



