Leguminaceae 233 
ZZ. Involucre not membranous, deeply lobed, the lobes laciniately and sharply 
toothed; flowers dark lilac-purple. 
d. Plant perennial with creeping rhizomes. W.E. (T. spinulosum; T. 
heterodon.) T. fimbriatum Lindl. 
~ dd. Plant annual. 
e. Leaflets obovate or obcordate, 0.6—1.2 cm. long; heads 1—1.4 cm. 
wide. W.C.E. T. variegatum Nutt. 
ee. Leaflets linear or oblong or lanceolate. 
f. . Leaflets 1.6—2 cm. long, obtuse or emarginate; heads 5——7-flow- 
ered, 1—1.5 cm. wide; calyx-lobes never 3-toothed. W. 
T. oliganthum Steud. 
ff. Leaflets 2.5—5 cm. long, obtuse or acute; heads more than 7-flow- 
ered, 2—3 cm. wide; calyx-lobes sometimes 3-toothed. WER Gia 
obtusiflorum.) TT. tridentatum Lindl. 
LOTUS (Hosackia) BIRD-FOOT TREFOIL 
if 5 . 
Herbs, annual or perennial. Leaves |- to several-foliolate (ours 3—15), ternate 


or pinnate; leaflets entire. Flowers | to several in a leaf-axil, often in umbels; peduncle 
none or naked or with |—5-foliolate bracts near the flower-cluster. Calyx 5-toothed or 
-cleft; teeth nearly equal. Petals free from the stamens, nearly equal; standard ovate 
or roundish; wings obovate or oblong; keel somewhat incurved, obtusely or acutely 
beaked. Stamens diadelphous, in groups of 9 and 1. Pods linear, flattish or terete, 
straight or arcuate, dehiscent or indehiscent, with spongy partition between the seeds. Seeds 
| to several. (A Greek name for some plants of this family. ) 


A. Annual; flowers solitary (sometimes 2 on a peduncle in L. parviflora). 
B. Flowers and pods nearly sessile. 
C. Stem glabrous, 3—6 dm. high, erect, sparingly branched: corolla pale yellow 
_to dark red. W.E.  L. denticulatus Greene 
CC. Stem pilose or villous, 1—1.5 dm. high, diffusely branched from the base, 
corolla bright yellow. U. (L. humistratus.) 
L. wrangelianus F. & M. 
BB. Flowers and pods with peduncles nearly as long as the leaves or longer. 
D. Leaflets lanceolate to ovate, usually villous; flowers 5-6 mm. long; bract at 
top of peduncle |—3-foliolate. W.E. (L. micranthus.) 
L. americanus Bisch. (Spanish Clover) 
DD. Leaflets oblong to ovate, usually glabrous; flowers 3—4 mm. long: bract at 
top of peduncle |—3-foliolate. E.  (L. micranthus.) 
L. parviflorus (Benth. ) 
AA. Perennial; flowers in umbels. 
E. Leaflets 3—9; flowers various but with some yellow in them. 
F. Leaves pubescent; flowers 4—13 mm. long. 
G. Stem procumbent or ascending, villous or tomentose; leaflets mostly acute, 
6—12 mm. long; pod |—2-seeded, its beak not hooked. W.E. (L. Dou- 
: glasit.) L. decumbens ( Benth.) 
. GG. Stems erect or ascending, finely pubescent; leaflets mostly obtuse, 1 3——25 
mm. long; pod 5 or more seeded, its beak hooked. U. 
L. torreyi Grecy\' 
FF. Leaves glabrous or nearly so; flowers 14—-20 mm. long. 
‘H. Flowers pure-yellow. E. 
L. macbridei Nels. 
HH. Flowers with yellow standard but white or purple wings. 

