252 



NORTH AMERICAN FLORA 



[Volume 24 



Pod inflated, the valves extended from the seeds. 



Legume membranous, lunate or obliquely ovoid in 

 side view, the upper suture less curved than the 

 lower. 

 Legume papery or, if membranous, ellipsoid or ovoid. 

 Pod membranous, when young the cavity filled 

 with spongy tissue, which in age becomes 

 fibrous. 

 Pod not filled with spongy or fibrous tissue. 

 Fruit perfectly or imperfectly 2 -celled, the lower suture inflexed, 

 forming a false, complete or partial partition (septum). 

 Septum incomplete, not meeting the upper suture. 

 Pod membranous or papery, more or less inflated. 



Body of the pod oblong to oval or oblong-oblanceolate in 

 outline, obtuse, the sutures equally curved or the 

 upper more than the lower, the cross-section elliptic to 

 orbicular, rarely slightly cordate. 

 Body of the pod more or less lunate, the lower suture 

 strongly upcurved, the upper less so or straight, 

 the cross-section broadly cordate or broadly del- 

 toid-ovate. 

 Corolla large; pod short-stipitate, not sulcate on the 



lower suture. 

 Corolla small; pod sessile, deeply sulcate on the 

 lower suture. (Abnormal form of Phaca diurna.) 

 Pod leathery or woody. 



Body of the leathery pod linear, lance-linear, or narrowly 

 lunate in outline, cordate or sub -terete in cross-section. 

 Body of the pod broadly oval to elliptic in outline. 



Pod mostly woody or somewhat fleshy, and some- 

 what compressed; septum broad, not reaching to 

 the apex. 

 Pod somewhat inflated, leathery, turgid; septum 

 narrow. 

 Septum complete, meeting the upper suture. 



Pod strongly inflated, papery or membranous. 



Pod sessile or subsessile, circular or oval in cross-section. 

 Pod distinctly stipitate, deltoid in cross-section. 

 Pod neither strongly inflated nor papery. 

 Fruit dry, dehiscent. 



Body of the pod elongate, linear or lance-linear, rarely 

 oblong, spreading. 

 Pod sessile or nearly so. 



Legume strongly falcate, splitting through the 

 middle into two pod-like parts, the walls of 

 which are formed one by the valve, the other 

 by half of the split septum. 

 Legume not so split in the middle. 



Pod leathery or woody, if membranous 



compressed, not inflated. 

 Pod membranous, terete, somewhat in- 

 flated and filled with a spongy tissue. 

 Pod distinctly stipitate. 

 Body of the pod short, ovoid or broadly oblong or 

 broader. 

 Pod distinctly stipitate. 

 Pod sessile or nearly so. 



Pod erect or ascending, neither didymous nor 



cross-wrinkled. 

 Pod reflexed, more or less didymous, cross- 

 wrinkled . 

 Fruit fleshy, indehiscent or very tardily dehiscent. 

 Keel produced into a distinct beak. 



Pod narrow, 2-celled by a false septum formed by the indexed 



lower suture. 

 Pod usually thick, 1 -celled or more or less 2-celled by the inflexion 

 of the upper suture. 

 Shrubs or trees, with abruptly pinnate leaves. 



43. Batidophaca. 



44. Pisopiiaca. 



45. Phaca. 



46. ATELOPHRAGMA. 



47. PhacomenE. 

 45. Phaca. 



49. Brachyphragma. 



50. jonesiklla. 



51. Cystium. 



52. Onix. 



53. CONTORTUPUCATA. 



54. Hamosa. 



55. Hedophylla. 

 49. Brachyphragma. 



56. HespEronix. 



57. Astragalus. 



58. Hesperastragalus. 



59. Geoprumnon. 



60. Oxytropis. 



61. Caragana. 



32. KENTROPHYTA Nutt.; T. & G. Fl. N. Am. 1: 353. 



1838. 



Perennial cespitose herbs, with a woody caudex and diffusely branched stems. Leaves 

 pinnate, the stipules either scarious and connate high up, or spine-tipped and less connate; 

 leaflets 3-7, mostly 5, divergent, linear-subulate or lance-subulate, stiff, strongly-ribbed, spine- 

 tipped. Racemes short, usually 2-flowered, and usually shorter than the leaves. Calyx 

 campanulate, the teeth subequal, subulate, about as long as the tube. Corolla ochroleucous 



