340 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
5. LUPINUS L. LUvpINe. 
Annual or perennial herbs, 10 to 100 cm. high, with palmate leaves and few or 
numerous rather large flowers in long or short terminal racemes; leaves alternate, the 
petioles dilated and somewhat clasping, bearing stipules on the expanded portion; 
calyx bilabiate, the upper lip more or less lobed, the lower entire or minutely toothed; 
corolla of various colors, the standard with recurved margins, more or less grooved in 
the median line; keel and wings various; stamens 10, monadelphous, the anthers 
alternately of two sizes; pistil simple, becoming a 2 to several-seeded flattened legume. 
A widely dispersed genus in the United States, although the species are much 
more numerous in the western part. Some of the species are of considerable economic 
importance because they are more or less poisonous to stock, 
KEY TO THE SPECIES, 
Annuals, small, usually not more than 30 cm. high. 
Pods more than 2-seeded; cotyledons petiolate. ........... 1. L. micensis. 
Pods 2-seeded; cotyledons sessile, clasping. 
Acaulescent plants, tufted; racemes pedunculate, head- 
like. 
Upper lobe of the calyx obsolete. .......-. . 2. DL, brevicaulis. 
Upper lobe of the calyx evident, deeply 2- lobed... 3. DL. dispersus. 
Stems evident, although sometimes short; racemes 
various, 
Racemes more or less elongated, several to many- 
flowered, shorter than the leaves; peduncles 
very short and stout; lower lobe of the calyx 
entire. ......-..-.2.2 22-2 eee eee eee eee 4. L. pusillus. 
Racemes headlike, on peduncles equaling ‘or ex- 
ceeding the petioles of the adjacent leaves, 
few-flowered; lower lobe of the calyx 2 or 3- 
toothed. 
Peduncles elongated, some of the flower clus- 
ters overtopping the leaves; branches 
ascending, not widely divaricate; plants 
conspicuously villous-hirsutulous....... 5. L. kingit. 
Penducles shorter, never much longer than the 
adjacent petioles, the flower clusters not 
overtopping the leaves; branches widely 
divaricate-spreading; pubescence softer, 
less copious, 
Upper surface of the leaves pubescent like 
the lower........----------------- 6. L. argillaceus. 
Upper surface of leaves glabrous......... 7. L, sileri. 
Perennials, 
Leaves permanently silky on the upper surface. 
Calyx distinctly saccate at the base.................-- 8. L. aduncus. 
Calyx not saccate.. 2.222.222.2222 eee eee eee eee eee 9. L. palmeri. 
Leaves glabrous on the upper surface. 
Stems hirsute. 
Calyx strongly gibbous; leaflets acute or obtuse. 
Leaflets obtuse; banner with a dark spot; Plants 
low....... wees eeeeeee .-10. L. ammophilus, 
Leaflets mostly ac ute; banner not with a ‘dark 
spot; plants tall..........0........00-. 16. L. amplus, 
