602 FABACEAE 



with slightly different blades. 3. C. sagittalis. 



** Steins and peduncles with short appressed hairs : lower and upper leaves 



with very different blades. 4. C. Pnrshii. 



a. Standard with a blade nearly or quite 2 cm. broad : blades of the upper leaves 



of a spatulate or oblanceolate type : stipules not decurrent. 



Bracts minute, caducous. 5. C. retusa. 



Bracts ovate, cordate, persistent. 6. C. spectabilis 



B. Leaves with 3-foliolate blades. 



Plants annual : keel-petals over 1 cm. long : pods 2.5-3.5 mm. long. 7. C. incana. 



Plants perennial : keel-petals less than 1 cm. long : pods 1-1.5 cm. long. 8. C. pumila. 



1. Crotalaria rotundifolia ( Walt. ) Poir. Perennial, conspicuously pubescent. Stems 

 tufted, often densely so, more or less spreading, 1-4 dm. long, like the peduncles pubescent 

 with loose or spreading hairs : leaves alternate ; leaflets solitary, the blades entire, mostly 

 orbicular or obovate near the base of the plant, oval, oval-ovate or broadly oblong above, 

 obtuse or mucronulate, hairy on both sides, sometimes glaucescent beneath, short-petioled : 

 calyx pubescent with relatively long loose hairs ; lobes of the lower lip about 10 cm. long, 

 slenderly acuminate : corolla yellow : standard with a blade 9-12 mm. broad : pods oblong, 

 2-3 cm. long. 



In dry or sandy soil, Virginia to Florida and Mississippi. Spring to fall. 



2. Crotalaria mail ima Chapm. Perennial, similar to C. rotundifolia in habit, but 

 slightly smaller and inconspicuously pubescent. Stems pubescent with short appressed 

 hairs : leaves alternate ; leaflets solitary, the blades entire, suborbicular to oval on the 

 lower part of the stems, somewhat narrower above, obtuse or acutish, sparingly pubescent, 

 short-petioled : stipules mostly decurrent but narrow : calyx pubescent with short closely 

 appressed hairs ; lobes of the lower lip mostly less than 10 mm. long, slightly acuminate : 

 corolla smaller than that of C. rotundifolia: pods 1.5-2.5 cm. long. 



In pine lands, Florida to Mississippi. Spring and summer. 



3. Crotalaria sagittalis L. Annual, or perennial southward, conspicuously pubescent. 

 Stems more or less tufted, 1-5 dm. tall, erect or ascending, often branched above, like the 

 peduncles with loose or spreading hairs : leaflets solitary, the blades oblong to lanceolate 

 or linear-lanceolate, 2-6 cm. long, often abruptly acute, sessile or nearly so : stipules de- 

 current, usually broad and conspicuous : calyx rather shaggy-pubescent ; lobes of the 

 lower lip 10 mm. long or nearly so, somewhat acuminate : corolla yellow ; standard with a 

 blade 6-11 mm. broad: pods 2.5-4 cm. long. 



In dry soil, New England to Minnesota, Florida and Texas. Spring to fall. 



4. Crotalaria Furshii DC. Perennial, similar to C. sagittalis in habit, but rather 

 fleshy and inconspicuously pubescent. Stems more or less tufted, 1-5 dm. long, often 

 branched, like the peduncles with short appressed hairs : leaflets solitary, the blades 

 various, those of the lower leaves spatulate or oblanceolate, those of the upper ones linear, 

 often narrowly so and much elongated, sometimes 12 cm. long, but usually shorter: 

 stipules mostly decurrent, narrow : calyx pubescent with appressed hairs ; lobes of the 

 lower lip commonly over 10 mm. long, slenderly acuminate : corolla yellow ; standard 

 with a blade 9-13 mm. broad : pods 2-3 cm. long. 



In grassy pine lands or sandy soil, Georgia and Florida to Louisiana. Spring to fall. 



5. Crotalaria retusa L. Annual, stout. Stems 4-9 dm. tall, more or less branched, 

 finely and softly pubescent : leaflets solitary, the blades cuneate to oblanceolate, 3-9.5 cm. 

 long, rounded or retuse at the apex, often glabrous above, more or less pubescent beneath, 

 short-petioled : stipules minute : racemes conspicuous, several-many-flowered : pedicels 

 5-10 mm. long, subtended by minute caducous bracts : calyx finely pubescent ; lobes of the 

 upper lip triangular-lanceolate, those of the lower lip lanceolate : corolla relatively large, 

 yellow ; standard with a blade usually about 20 mm. broad : pods 3-5 cm. long, spreading 

 or drooping. 



In sand or sandy soil, peninsular Florida and the Keys. Also in tropical America 



6. Crotalaria spectabilis Roth. Similar to C. retusa but rather larger. Stems 5-18 

 dm. tall, leafy, pale-pubescent : leaflets solitary, the blades dark green above, pale beneath, 

 often minutely bristle-tipped : stipules small but broad : flowers nearly similar to those of 

 (7. retusa, but commonly slightly smaller : pedicels clavate, subtended by ovate-cordate 

 acuminate bracts. 



In sand or sandy soil, Key West, Florida. Also in tropical America. 



7. Crotalaria incana L. Annual, minutely pubescent. Stems more or less branched, 

 5-13 dm. tall: leaves often numerous; leaflets* 3, the blades oval to obovate, 1-3.5 cm. 

 long, rounded or truncate at the apex, sometimes glabrous : the terminal one usually 

 shorter than the petiole : calyx becoming 10-12 mm. long : corolla greenish yellow ; 

 standard over 10 mm. long : pods 2.5-4 cm. long. 



In sand or sandy soil, peninsular Florida and the Keys to Texas. Also in tropical America. 



