LEGUMINOS^E. CLXXIV. OROBUS. CLXXV. PLATYSTYLIS. 



341 



bose stigma ; legumes compressed, somewhat elliptic, irregularly 

 and reticulately veined. 7/ . H. Native of Algiers, in unculti- 

 vated fields, and of Calabria. O. Siculus, Rafin. O. Rafinesquii, 

 Presl. del. pr. p. 41. Petals elongated, purple. 



Dark-purple-fiowered Bitter-Vetch. PI. 1 to 2 feet. 



39 O. SAXA'TILIS (Vent. hort. eels. t. 94.) stems simple, 

 weak ; leaves with 2 pairs of linear leaflets ; stipulas small, semi- 

 sagittate; peduncles 1-flowered, much shorter than the leaves, 

 articulated, and bracteolate ; calycine segments lanceolate, nearly 

 equal, shorter than the tube ; legumes nearly cylindrical, grey. 

 Q. H. Native of Provence, on arid hills. D. C. fl. 1'r. 4. 

 p. 589. Flowers blue and white mixed. 



Rock Bitter- Vetch. Fl. June, Aug. Clt. 1820. PI. -J foot. 



40 O. LONGIFOLIUS (Nutt. gen. amer. 2. p. 95.) plant clothed 

 with silky villi ; leaves ternate, and with 2 pairs of leaflets, upper- 

 most ones simple ; leaflets very long, filiform-linear ; stipulas un- 

 divided, ovate-lanceolate, acuminated ; racemes pedunculate, fili- 

 form, shorter than the leaves ; 2 upper teeth of calyx shortest. 

 I/ . H. Native of North America, on the plains of the Missouri. 

 Psoralea longifolia, Pursh. fl. sept. amer. 2. p. 741. Racemes 

 usually solitary. Flowers pale-red. Roots creeping. 



Long-leafletted Bitter- Vetch. PI. 1 foot. 



41 O. ? DI'SPAR (Nutt. gen. amer. 2. p. 95.) leaves unequally 

 pinnate, with 6-8 pairs of linear obtuse leaflets ; stipulas simple, 

 ovate ; racemes sessile, twin or tern ; segments of the calyx 

 equal, the superior indenture, however, more profound and wider 

 than the rest; legumes, glabrous. If. H. Native of North Ame- 

 rica, on arid hills about Fort Mandan. Flowers cream-coloured, 

 having the wings longer than the keel. Habit of a species of 

 Astragalus. 



Unlike Bitter- Vetch. PI. decumbent. 



{ Species not sufficiently known. 



42 O. ? PROCU'MBENS (Mill. diet. no. 1 1.) stems procumbent ; 

 leaves impari-pinnate, tomentose ; outer leaflets largest ; leaflets 

 5 pairs. Native of Mexico, about Vera Cruz. Flowers bright 

 purple, disposed in short axillary racemes. Legumes compressed. 

 Seeds 6, roundish. 



Procumbent Bitter- Vetch. PI. procumbent. 



43 O. VENE TUS (Mill. diet. no. 8. fig. t. 1 93. f. 2.) stems simple ; 

 leaves with 4 pairs of ovate acute leaflets ; legumes tumid, con- 

 taining 3-4 roundish seeds ; peduncles 4-flowered. H..H. Na- 

 tive of Germany and Italy. Flowers purple. Perhaps a variety 

 of 0. vernus. 



Venetian Bitter- Vetch. Fl. March, April. PI. 1 foot. 



44 O. MONTA'NUS (Scop. fl. earn. 2. p. 80. t. 41.) stem simple, 

 striated; leaves with 3-4 pairs of ovate leaflets; racemes 5-6- 

 flowered, a little longer than the leaves ; legumes glabrous, pur- 

 ple. I/ . H. Native of Carniola. Flowers yellowish-white. 

 Perhaps a variety of O. vernus. 



Mountain Bitter- Vetch. PI. 1 foot. 



45 O. ? COCCI'NEUS (Mill, diet. no. 12.) stems procumbent; 

 flowers axillary and terminal ; leaves abruptly-pinnate, with 3- 

 4 pairs of linear villous leaflets. !{.. S. Native of Mexico, 

 about Vera Cruz. Peduncles short, 3-4-flowered. Flowers small, 

 scarlet, succeeded by short taper pods, containing 3-4 small 

 roundish seeds each. 



Var. /j, unijugus (Ser. in D. C. prod. 2. p. 380.) stipulas semi- 

 hastate ; leaves with one pair of linear-lanceolate leaflets ; 

 flowers solitary, length of the pedicels. Lodd. bot. cab. 883. 



/Scar/e<-flowered Bitter-Vetch. Fl. April, May. PI. pro- 

 cumbent. 



4G O.? ARGE'NTEUS (Mill. diet. no. 10.) stems erect, tomen- 

 tose ; leaves pinnate ; leaflets oblong-ovate, silky beneath ; 

 flowers disposed in terminal spikes. Jj . S. Native of Mexico, 

 about Vera Cruz. Leaves with 4-8 pairs of leaflets, hairy on 



the upper surface. Flowers deep purple, succeeded by long, 

 woolly, compressed pods, each containing 4-5 seeds. 



Silvery Bitter- Vetch. Shrub 5 to feet. 



47 O. ? AMERICA'NUS (Mill. diet. no. 9.) stem much branched, 

 frutescent ; leaves pinnate, with 5-6 pairs of linear-lanceolate 

 leaflets, which are tomentose beneath ; legumes compressed, 

 glabrous. Ij . G. Native of Jamaica. Flowers pale purple, 

 disposed in loose terminal spikes. 



American Bitter- Vetch. Clt. 1731. Shrub 3 feet. 



Cult. O'robus is a genus of very elegant pea-flowering plants, 

 and being all hardy, deserve to be cultivated in every flower 

 border. They thrive best in light soil, and are easily propagated 

 by seeds, or by dividing the plants at the roots in spring. 



CLXXV. PLATY'STYLIS (from TrXarue, platys, broad, and 

 oruXof , stylos, a style ; in reference to the dilated style, which 

 separates the genus from O'robus). Sweet, fl. gard. 239. 



LIN. SYST. Didde/phin, Decdndiia. Calyx campanulate, 5- 

 cleft, the 2 upper lobes shortest. Corolla papilionaceous. Sta- 

 mens diadelphous. Style broad, spatulate, villous at the apex. 

 Legumes oblong, many-seeded ; seeds nearly globose. Erect 

 herbs, with semi-sagittate stipulas. Leaves abruptly-pinnate, 

 with few pairs of leaflets. Petioles ending in a bristle. 



1 P. CYAN-E'A (Sweet, fl. gard. 239.) stem simple, striated; 

 leaves with 2-3 pairs of approximate, linear-lanceolate, acute 

 leaflets ; stipulas about equal in length to the petioles ; peduncles 

 few-flowered, longer than the leaves ; calycine segments lanceo- 

 late, hardly the length of the tube. ^ . H. Native of Eastern 

 Caucasus, in subalpine places. O'robus cyanse'us, Stev. in mem. 

 soc. cur. mosq. 4. p. 51. Bieb. fl. taur. suppl. p. 464. Flowers 

 large, bluish purple. 



Blue-fiowered Platystylis. Fl. May, June. Clt. 1823. PI. 1 ft. 



2 P. SESSILIFOLIA (Sweet. 1. c. in a note,) stems simple, 

 striated ; leaves with 1 pair of linear-subulate approximate 

 leaflets ; stipulas semi-sagittate, subulate, much longer than the 

 petioles ; peduncles few-flowered, longer than the leaves ; caly- 

 cine segments linear, hardly the length of the tube; style jointed, 

 spatulate; legumes narrow. l/.H. Native of Tauria, in woods, 

 and about Athens in Greece. O'robus sessilifolius, Smith, fl. 

 graec. t. 692. ex prod. 3. p. 64. O. digitatus, Bieb. fl. taur. 2. 

 p. 153. et suppl. 462. Buxb. cent. 2. p. 36. t. 38. Flowers 

 large, bluish purple. 



Sessile-leafletted Platystylis. Fl. May, Ju. Clt. 1823. PI. 1 ft. 



3 P. STIPULA'CEA ; stem erect, angular, branched above; 

 leaves with 2-3 pairs of linear, attenuated, very long leaflets, 

 which are obscurely 3-nerved, and glabrous ; stipulas large, 

 semi-sagittate ; peduncles axillary and terminal, few-flowered, 

 shorter than the leaves ; calycine teeth unequal, lower ones the 

 longest. 7 . H. Native of Siberia ? O'robus stipulaceus, Hook, 

 bot. mag. 2937. Flowers with a purple vexillum, blue wings, 

 and purple keel. 



Lurge-stipuled Platystylis. Fl. May. PI. 1 foot. 



Cult. Elegant plants, well adapted for the front of flower 

 borders. A light sandy soil suits them best, and they are easily 

 increased by seeds, or by dividing the plants at the roots in 

 spring. 



Tribe V. 



PHASEO'LETE (plants agreeing with Phaseolus in some im- 

 portant characters). Bronn. diss. p. 133. D. C. legum. mem. 

 ix. prod. 2. p. 381. Phaseoli, Adans. fam. 2. p. 325. exclusive 

 of numerous genera. Corolla papilionaceous (f. 47. c. f. 48. &.). 

 Stamens monadelphous (f. 49. a.), but usually diadelphous (f. 

 48. e. f. 47. g.\ 9 joined together, and 1 free. Legume many- 

 seeded, dehiscent, continuous, usually subdivided internally into 



