FABACEAE. 165 



Common, naturalized in waste places and on roadsides. Native in woods along 

 the Susquehanna River. FALSE-ACACIA. LOCUST-TREE. 



12. STYLOSANTHES Sw. Perennial herbs. Leaflets 3, veiny. Flowers 

 of two kinds, the one complete, but sterile, the other without perianth, but 

 fertile. Calyx 2-lipped: upper lip with 2 broad lobes: lower lip with the 

 middle lobe longer and narrower than the lateral ones. Corolla yellow or 

 orange, persistent: standard with a very broad blade: blades of the wings and 

 the keel-petals auricled, the latter incurved. Loment flat, 1- or 2-jointed, the 

 lower joint empty, the upper one opening at the apex. Sum. PENCIL- 

 FLOWER. 



Blade of the standard longer than wide, the spurs curved : terminal joint of the 

 pod with a lateral beak. 1. S. biflora. 



Blade of the standard wider than long, the spurs straight : terminal 



joint of the pod with the beak nearly axial. 2. S. riparia. 



1. S. biflora (L.) B.S.P. Plants upright, the stem finely pubescent: leaflets 

 9-35 mm. long; blades elliptic, linear-elliptic, lanceolate, or oblanceolate : 

 standard 6-7 mm. long: terminal joint of the pod very inequilateral, about 5 

 mm. long. N. S. Common, on dry banks. Sandstones and shales, schists. 



2. S. riparia Kearney. Plants decumbent: leaflets 10-18 mm. long; blades 

 elliptic, oblanceolate, or cuneate-obovate, thinner than those of S. biflora: 

 standard 8-9 mm. long: terminal joint of the pod slightly inequilateral, 3-4 

 mm. long. S. Eather rare, on roadsides and banks. Schists. 



13. MEIBOMIA Heister. Herbs, shrubs, or vines. Leaflets 3, or rarely 

 1 or 5. Racemes simple or compound. Calyx 2-lipped, sometimes obscurely so, 

 the middle lobe of the lower lip often smaller or narrower and longer than 

 the lateral ones. Corolla variously colored or white: standard with a broad 

 blade: blades of the wings and the keel-petals auricled on one side, short- 

 clawed. Ovary slender. Loment few-several-jointed, usually with hooked 

 hairs. Sum. TICK-TREFOIL. BEGGAR 'S-TICKS. 



Calyx shallowly lobed : loments straight along the dorsal suture, deeply constricted 



along the ventral suture, long-stipitate. 

 Terminal leaflet-blades relatively scarcely wider than the lateral ones : peduncle 



arising from the rootstock. 1. M. nudiflora. 



Terminal leaflet-blades conspicuously wider than lateral 



ones, or wider than long : peduncle terminating the stem. 2. M. grandiflora. 

 Calyx deeply lobed : loments constricted on both sutures, 

 but more deeply so in the ventral than the dorsal side, 

 short-stipitate or nearly sessile. 



Stem and branches weak, trailing : stipules broad. 3. M. Michauxii. 



Stem and branches rigid, erect or ascending : stipules 



narrow. 



Leaves with very short or no petioles. 4. M. sessilifolia. 



Leaves with relatively long petioles. 



Joints of the loments manifestly longer than broad. 

 Bracts small and inconspicuous : panicle-bran- 

 ches long-hairy : leaflets with obtuse or ob- 



tusish yellowish-green rough-pubescent blades. 5. M. canescens. 

 Bracts large and conspicuous : panicle-branches 

 short-hairy : leaflets with acuminate glabrous 

 blades, glaucous beneath. 6. M. ~bracteosa. 



Joints of the loments only slightly longer than 



broad. 

 Loments manifestly stipitate. 



Calyx eciliate : plants glabrous or nearly so. 7. M. paniculata. 

 Calyx ciliate : plants pubescent or scabrous- 

 pubescent. 



Standard 5-6 mm. long : leaflet-blades 

 leathery, velvety beneath : loment- 

 joints rounded. 8. Jlf. viridiflora. 



