596 FABACEAE 



to oblong-oblanceolate or oval, 2-5 cm. long, mucronate or notched at the apex, reticulated 

 and lustrous above : racemes 5-12 cm. long, densely flowered : pedicels 5-15 mm. long : 

 calyx campanulate, 8-10 mm. long ; tube oblique, turbinate at the base ; lobes unequal, 

 the 2 upper ones mostly united, the lower ovate to triangular : corolla violet ; standard 

 with a suborbicular or ovate crisped notched blade 1-1.5 cm. long ; other petals with 

 oblong-obovate blades : pods 5-10 cm. long, 3-4-seeded, constricted between the seeds. 

 Along limestone bluffs, Texas to New Mexico and Mexico. Spring and summer. 



2. CLADRASTIS Kaf. 



Small trees, with watery sap and yellow wood. Leaves alternate, without stipules, 

 deciduous : blades unequally pinnate : petioles stout, enlarged at the base : leaflets mostly 

 alternate, with entire blades. Flowers perfect, in elongated terminal thirsoid panicles : 

 calyx nearly tubular, somewhat oblique, puberulent : lobes 5, short and broad. Corolla 

 white : petals 5, all with claws of about the same length : standard with an oblong-orbicu- 

 lar blade, somewhat emarginate, undulate : wings with an oblong straight auricled blade, 

 this blotched with yellow : keel-petals distinct, much like the wings. Stamens 10 : fila- 

 ments distinct, glabrous. Ovary narrow, stalked, villous. Style subulate, slightly incurved. 

 Pod linear, flattened, glabrous, short-stalked, tardily dehiscing, slightly thickened at the 

 margins. Seeds oblong, flattened. YELLOW-WOOD. 



1. Cladrastis lutea (Michx. ) Koch. A tree reaching a height of 17 m., with a 

 smooth bark and almost glabrous foliage. Leaves 2-4 dm. long ; leaflets with membranous, 

 oval to oblong or ovate or even suborbicular blades, or the terminal one sometimes cuneate, 

 somewhat acuminate at the apex, the nerves and short stalk more or less pubescent : 

 panicles loosely many-flowered, 1-5 dm. long: pedicels 1-2.5 cm. long: calyx tubular- 

 campanulate, the base of the tube oblique and turbinate : lobes rounded, much shorter than 

 the tube : corolla white : petals more or less crisped : pods linear-oblong, acute at each end, 

 4-8 cm. long, short-stalked. [(7. tinctona Kaf.] 



In rich soil, Kentucky to Tennessee and North Carolina. Spring and summer. 



3. THERMOPSIS K. Br. 



Perennial caulescent herbs, with horizontal rootstocks. Leaves alternate, with leaf- 

 like stipules : blades digitately 3-foliolate : leaflets nearly equal, with entire membranous 

 blades. Flowers perfect, in terminal or lateral racemes. Calyx pedicelled : lobes nearly 

 equal or the 2 upper wholly united. Corolla yellow or rarely purple : standard with a 

 broad spreading blade, the sides reflexed : wing-petals with oblong blades : keel as, long as 

 the wings or longer. Stamens 10, distinct. Anthers nearly alike. Ovary sessile or 

 nearly so, narrow. Style slightly incurved. Ovules numerous. Pod narrow, often linear, 

 flat, 2-valved. 



Stems branched above the base : pods glabrous or nearly so. 



Peduncles and pedicels closely pubescent : calyx-tube pubescent. 



Lower calyx-lobes triangular, much shorter than the tube. 1. T. mollis. 



Lower calyx-lobes lanceolate, as long as the tube. 2. T. Hugeri. 



Peduncles and pedicels glabrous or sparingly pubescent : calyx-tube glabrous. 3. T. fraxinifolia. 



Stems simple above the base : pods woolly. 4. T. Caroliniana. 



1. Thermopsis mdllis (Michx.) M. A. Curtis. Foliage pubescent with minute ap- 

 pressed hairs. Stems 3-9 dm. tall, branching : stipules oblong-lanceolate : leaflets 3, the 

 blades oblanceolate to elliptic, notched or acute at the apex, acute at the base : racemes 

 erect, 1-3 dm. long, loosely flowered : pedicels 7-15 mm. long, subtended by lanceolate or 

 oblong-lanceolate bracts : calyx campanulate ; lobes triangular, acute, ^ as long as the tube r 

 corolla yellow : pods linear, 5-10 cm. long, slightly curved. 



In dry soil, Virginia to North Carolina and Alabama. Spring and summer. 



2. Thermopsis Hugeri Small. Foliage minutely pubescent, but little changed in 

 drying. Stems 3-6 dm. tall, branching : stipules lanceolate or linear-lanceolate, 1.5-2 cm. 

 long, acute : leaflets 3, the blades elliptic, somewhat acuminate at both ends or those of the 

 lower leaves oblanceolate, 5-6 cm. long, somewhat lustrous above, the minute pubescence 

 often abundant at the conspicuous nerves : racemes about 1 dm. long, few-flowered : pedicels 

 4 6 mm. long, with bracts similar to the stipules : calyx campanulate, 6-7 mm. long ; lobes, 

 except the upper one, lanceolate-acuminate, about as long as the tube : corolla bright 

 yellow ; standard with a suborbicular notched blade about 12 mm. in diameter ; wings 

 nearly 2 cm. long, their blades almost oblong ; keel-petals similar to the wings, but oblong- 

 obovate. [Baptisia Hugeri Small.] 



On mountain slopes, North Carolina and Georgia. Spring. 



