ROBINSON AND GREENMAN. — MEXICAN PLANTS. 385 
bluffs of a barranca near Guadalajara, 26 September, 1891 (no. 
5179), and again on hillsides near the same locality, 6 September, 
1893 (no, 4522). 
Var. exiguum. Very similar to the preceding, but the leaflets of 
the 1-3-foliate upper leaves almost linear: segments of the pod a little 
broader. — D. exiguum, Gray, Pl. Wright. ii. 46; Torr. Bot. Mex. 
Bound. 57. — New Mexico, Wright (no. 1010) ; Santa Cruz, Sonora, 
Thurber (no. 933), and San Jose del Cabo, Lower California, Brande- 
gee (no. 145), Although referred to D. Neo-Mexicanum, Gray, by 
Dr. Watson, Bibl. Index, 217, this variety appears to us distinct from 
that species which has an essentially flat pod and leaflets usually 
narrow throughout. 
Var. annuum. Leaves unifoliate (rarely one or two trifoliate) : 
leaflets broadly ovate. rather large, 14 inches long: segments of the pod 
14-13 lines broad. — D. annuum, Gray, Pl. Wright. ii. 46. Referred 
to D. spirale by Watson, Bibl. Index, 218. — New Mexico, Wright, 
(no. 1009 a); Sonora, Thurber (no. 934). 
Var. BiceLtovir. Leaves chiefly trifoliate, with oblong-lanceolate 
leaflets (about 1-1} inches long), one or two of the lowest leaves 
unifoliate with a small broad leaflet: segments of the pod 14 lines oF 
more in breadth, slightly twisted. — D. Bigelovii, Gray, Pl. Wright. 
ii. 47. D. Neo-Mexicanum, var. Bigelovii, Wats. Bibl. Index, 2175 
referred to D. spirale by Grisebach, Fl. Brit. W. I. 188.— New 
Mexico, Wright (no. 1012); Sonora, Thurber (no. 955) ; W. Texas, 
Havard (no. 22); San Luis Potosi, Parry § Palmer (no. 181); 
Schaffner (no. 796 in part); §. Arizona, Rothrock (no. 663) 
Lemmon (no. 539); Mexican Bound. Surv. (no. 277); Chihuahua, 
Pringle (no. 612). This variety differs from D. Neo-Mexicanum ™ 
its broader leaflets and in the somewhat twisted segments of its 
legumes ; from variety transversum it differs in its decidedly broader 
pods, as well as in its generally taller habit and larger leaflets. 
PHASEOLUS MONOSPERMUS. Stem slender, twining, light-colored, 
sparingly pubescent with hooked hairs: stipules ovate, scarcely a line 
long; petioles slender, 1-1} inches long; leaflets 3, deltoid-ovate, 
entire, membranaceous, green on both surfaces, narrowed to an obtuse 
and mucronate apex, subtruncate at the base, finely ciliated ie, SHER the 
margins and veins, 15-22 lines long, three fourths as broad; stipels 
minute, spreading: racemes 4-6 inches long; rachis pubescent, florif- 
erous from below the middle; bracts ovate, obtuse, a line in length; 
pedicels twice as long, single or in pairs: flowers small, purplish : 
_ ealyx about a line long, 5-toothed: vexillum 2 lines long, equally 
VOL. XXIX. (N. 8. XXI.) 25 
