278 LEGUMINOS^. Phaseolcs. 



almost subulate. Flowers about as large as the preceding species. Style 

 narrowly linear, pubescent nearly the whole length of the upper surface. 

 Legume large, glabrous. — Allied to the preceding, but quite distinct. 



4. ASTROPHIA. Nuti. mss. 



Calyx campanulate, 5-cleft; the 2 upper segments a little shorter. Style 

 flat, linear, pubescent along the inside. Legume broadly oblong, compressed, 

 few-seeded. — A perennial herbaceous silky-villous plant. Stem erect, branch- 

 ing. Leaves pinnately 4-6-foliolate ; the petiole terminated by an abortive 

 leaflet. Peduncles axillary, few-flowered, 



A. Uttni-alis (Nutt. ! mss.) 



"Sand hills near the estuary of the Oregon. — Roots slender, horizontal. 

 Plant thickly clothed with a soft silky gray pubescence, branching from the 

 base, with numerous infertile axillary branchlets. Stipules more than twice 

 the size of the leaflets, oblong, inequilateral and somewhat produced at the 

 base on one side, but scarcely semihastate. Leaves small. Leaflets 2-3 

 pairs, Unear-spatulate, about half an inch long and li line wide ; the termi- 

 nal leaflet scarcely one-fourth the size of the others (appearing like a slight 

 expansion of the apex of the petiole). On some of the branches the lowest 

 leaves are 3-cleft, instead of pinnate. Racemes pedunculate, about 5-flower- 

 ed. Perfect flowers not seen. Segments of the calyx lanceolate, acute, 

 about as long as the tube. Ovary S-10-ovuled. Legume about li inch long 

 and half an inch wide, villous, with 2-3 perfect seeds. Seeds globose, brown, 

 with a linear semicircular hilum. — The plant has somewhat the habit of 

 Orobus, but the pod is flat and broad." NuttalL 



Tribe II. PHASEOLE^. Bro7in ; Benth. 



Corolla papilionaceous. Stamens diadelphous (9 & 1), or rarely 

 somewhat rnonadelphous. Disk usually a membranous sheath sur- 

 rounding the base of the ovary. Legume continuous, never separat- 

 ing into joints, but often torose and with cellular partitions between 

 the seeds, dehiscent. Seeds usually reniform, convex or compressed. 

 Radicle incurved. — Twining (sometimes erect or prostrate) herbace- 

 ous or shrubby plants. Leaves usually pinnately trifoliolate (rarely 

 reduced to a single leaflet), sometimes unequally pinnate, stipellate. 

 Inflorescence axillary, seldom terminal, racemose or somewhat pani- 

 cled. 



Subtribe 1. Euphaseoleje, Benth, — Ovary with several ovules. Inflo- 

 rescence racemose with the pedicels usually aggregated on alternate knobs. 

 Vexillum usually biappendiculate at the base. Style often indurated above 

 the middle. Cotyledons thick, nearly unchanged in germination, and either 

 rising out of the ground or remaining beneath the surface. 



1. Leaves pinnately trifoliolate. 



5. PHASEOLUS. Linn. ; DC. proclr. 2. p. 390 ; Benth. Leg. geii. p. 73. 



Calyx campanulate, 5-toothed or 5-cleft ; the 2 upper teeth often more or 

 less united. Keel with the stamens and style spirally twisted or circinate. 



