692 FABACEAE 
and the keel usually pe tipped; standard 12-17 mm. long, the blade nar- 
rowly obovate: pod 12-14 mm. long, lanceolate in outline. [Psoralea bitumi- 
nosum L.]—Waste-places, xol Plain, Fla. to La. Nat. of O. W.—Sum.- 
18. ORBEXILUM c Perennial herbs with gale or fusiform roots, 
rarely woody at the base. aflets r3o ely 5: blades entire. Spikes 
or racemes ur peduneled. ridi nci vindi. -dotted: tube campanulate: 
lobes narrow or broad, the lower one often the longest. Corolla longer than 
the ealyx, mostly blue or purple: standard with a broad blade: wings longer’ 
than the standard. Pod short, not included, cross-wrinkled, the beak in- 
eurved.—Hight species, North tenn 
Pod dne ovoid: plants with rootstocks: blades of the leaflets of the upper 
leaves ovate to ovate-lanceolate. I. MACROPHYLLA. 
dics D plants with fusiform roots: blades of the lea 
S of the upper iu ues linear to near A A cdi 
on unti. elliptic II. VIRGATA. 
I. MACROPHY 
Blades of the leaflets rounded at the base: inc endis 6-7 long. 
. 0. Onobrychis. 
Blades of the leaflets cordate or truncate at the base: wing- 
petals 8-9 mm. long. 
II. VIRGATA 
Leaves mostly 1-foliolate. . O. virgatum. 
Leaves 3-foliolate 
Bracts lanceolate: corolla 7—9 mm. 
Bracts broadly ovate: corolla 4-6 m ng. 
Calyx obscurely flange dotted ape lobes lance- 
mm. 
1 
2. O. macrophyllum. 
3 
4 
. O. simples. 
olate, longer than the tube. 5. O. pedunculatum. 
Calyx conspicuously glandular- dotted; upper deltoid, 
Shorter than the tube. 6. O. gracile. 
1. O. Onobrychis (Nutt.) Rydb. Plant 9-20 dm. tall: leaflets 3; blades 
ovate to ovate- LOCO REB, 3-12 em. long: calyx-lobes ovate or deltoid, obtuse, 
shorter than the tube: stan ^s ard 3-4 mm 
long: ovary glabrous: pod 8-10 mm. lo ong, 
| e E. reticulate. — ond Ono- 
brychis Nutt.]—Along streams, interior 
provinces, Tenn. to Mo. and Ohio.—Sum 
2. O. macrophyllum (Rowlee) Rydb. Plant 
9-9 dm. tall: leaflets 3; blades broadly 
ovate, 6-10 em. long: cal yx-lobes lanceolate, 
— [Psoralea macrophylla | Kowlee]— 
Woods, s Tryon Mt. in the Blue Ridge, N. C. 
—Spr 
virgatum (Nutt.) Rydb. Plant 3 
dm . tall, a leaflets mostly 1; blado a often narrowly so, o 
lower ones elliptie or ovate- E ic, 5— 8 em. lon : lateral ealyx-lobes lanceolate 
to elliptic. -lanceolate, acu pad lo wer lobe Si ightly longer and 
corolla purplish; stan da rd m. long, the blade broadly cune Es E 
about 4 mm. long, much ind the calyx, the minute beak 2 [Po oralea 
virgata Nuit. ]—Pinelands, Coastal Plain, Fla. and Ga.—Spr.- 
4, O. simplex (Nutt. Rydb. Plant 3-9 dm. tall, Pan AE Rs 
3; blades linear-lanceolate to linear or narrowly linear-ellipti 
lateral ealyx-lobes ovate, acute; lower lobe longer Ed bro ader rt ay a purple; 
standard 7-9 mm. long, the blade broadly RUE inequilateral: pod about 
