340 



CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



5. LUPINUS L. Lupine. 



Annual or perennial herbs, 10 to 100 cm. liigh, with palmate leaves and few 6r 

 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 tTie 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- 

 Uke. 



Upper iobe of the calyx obsolete 2. L. brevicauUs. 



Upper lobe of the calyx evident, deeply 2-lobed... 3. L. 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 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. hingii. 



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 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 10. L. aimnophilus. 



Leaflets mostly acute; banner not with a dark 



spot; plants tall IG. L. amplus. 



