FABACEAE 621 
phous: anthers alike or nearly so. Ovary sessile or short-stalked. Style filiform or. 
dilated at the base. Ovules solitary or rarely 2 in a cavity. Pod broad, indehiscent. 
Leaf-blades palmately 3-5-foliolate or rarely 7-foliolate. 
Plants tall, with erect or ascending stems or branches. 
Corolla 4-8 mm. long. 
Pods lunate, with wrinkled sides. 1. P. Lupinellus. 
Pods ovoid or ovate. 
Pod abruptly narrowed into a short beak. 2 
Pod gradually narrowed into a slender elongated beak. 
Leaflets mostly 3: calyx filiform-pediceled, finely pubescent. 3. P. linearifolia. 
Leaflets mostly 5: calyx sessile or nearly so, densely silky. 4. P. digitata. 
Corolla 10-20 mm. long. 
Bract fully as long as the calyx. 
. P. floribunda. 
Leaflets broadest at the middle: corollas about 1 em. long. 5. P. Reverchonit. 
Leaflets broadest above the middle: corollas 1.5-2 em. long. 6. P. cuspidata, 
Bract about as long as the pedicel or shorter. 
Leaflets linear, many times longer than broad : stemssimpleornearlyso. 7. P. cyphocalyz. 
Leaflets broadest above the middle, barely twice as long as broad : stems 
widely branched. 8. P. canescens. 
Plants low, acaulescent or acaulescent-like, with spreading stems or branches. 
Petioles strigose. 9. P. hypogaea. 
Petioles hirsute, 
Leaflets glabrous except the margins and midnerve: calyx-lobes about as 
broad as long. . P. subacaulis. 
Leaflets pubescent: calyx-lobes elongated. 11. P. esculenta. 
Leaflets pinnately 3-foliolate or rarely 1-foliolate. 
Racemes short, subglobose to oblong. 
Corolla 5-7 mm, long. 
Pods suborbicular, reticulated. 12. P. virgata. 
Pods ovoid, not reticulated. ys 
Stems or branches trailing: leaflets with entire blades. 13. P. rhombifolia. 
Stems or branches erect: leaflets with toothed blades. 14. P. Americana. 
Corolla 10-20 mm. long. 15. P. simplex. 
cemes elongated, cylindric. 
Leaflets less than 2 cm. broad : pods suborbicular, about 5 mm. long. i 
Upper calyx-lobes triangular or triangular-ovate. : 16. P. gracilis. 
Upper calyx-lobes lanceolate. 17. P. pedunculata. 
Leaflets over 2 em. broad : pods ovate, about 10 mm. long. 
Blades of the leaflets with rounded bases: standard with a blade 2-3 mm. 
wide. 18. P. Onobrychis. 
Blades of the leaflets with cordate bases: standard with a blade 7-8 mm. 
broad. 19. P. macrophylla. 
l. Psoralea Lupinéllus Michx. Foliage glabrous, somewhat glandular. Stems 
erect or nearly so, 2-6 dm. tall, often branched throughout : stipules setaceous : petioles 
usually shorter than the leaflets: leaflets 5-7, the blades linear-filiform, or those on the 
lower part of the stem narrowly linear, 3-8 cm. long: peduncles surpassing the subtend- 
ing bracts: racemes shorter than the peduncles: calyx campanulate ; lobes triangular to 
triangular-lanceolate, the shorter ones nearly as long as the tube: corolla blue or violet, 
er oe: pods lunate, about 1 cm. long, twisted, longitudinally wrinkled, with a 
e ak. 
In sandy pine lands, North Carolina to Florida. Spring and summer. 
2. Psoralea floribünda Nutt. Foliage canescent. Stems erect, 3-12 dm. tall, pro- 
fusely branched : stipules subulate: petioles shorter than the leaflets: leaflets 3-7, the 
blades oblong-linear or oblong-oblanceolate, 1-3.5 cm. long, glandular: peduncles sur- 
passing the subtending bracts : racemes commonly about as long as the peduncles: calyx 
campanulate ; lobes triangular, except the lower one, shorter than the tube : corolla bluish 
purple, 4-5 mm. long: pods ovoid, 6-8 mm. long, glandular, with stout straight beak. 
On prairies, Illinois to Montana, Texas, Arizona and Mexico. Spring to fall. 
3. Psoralea linearifdlia T. & G. Foliage strigillose or glabrate in age, more or less 
glandular, Stems erect, 2-6 dm. tall, widely branched : stipules setaceous to narrowly 
anceolate : leaflets 1-3, the blades linear, 2-6 cm. long, wrinkled : peduncles much longer 
than the subtending bracts: racemes as long as the peduncles or shorter : calyx slightly 
pubescent ; tube campanulate ; lobes ovate or oblong-ovate, about as long as the tube: 
egi s, 7-8 mm. long: pods oblong-ovoid, 8 mm. long, glandular, with a straight 
ak, 
On prairies, Nebraska to Texas. Spring and summer. 
ie 4. Psoralea digitata Nutt. Foliage pubescent with appressed hairs. Stems erect, 
1 dm. tall, branched : stipules lanceolate : leaflets 3-5, the blades linear to narrowly ob- 
anceolate, 2-3.5 em. long, acute, somewhat glandular: peduncles elongated, longer than 
1 © racemes: calyx silky, accrescent; tube turbinate-campanulate ; lobes acuminate, the 
n one longer than the tube: corolla 7-8 mm. long; pods obliquely oval, included in 
e calyx, minutely pubescent, the body 5-6 mm. long. the beak 4— mm. long. 
In sandy soil and on prairies, South Dakota to Texas. Spring and summer. 
