SMITH: STUDIES IN THE GENUS LUPINUS 13 
CALIFORNIA. Yolo County: Madison, Heller & Brown 5415 
(DS, US, PA, NY, G). Contra Costa County: Antioch, 3 May, 
1894, A. Eastwood (G, UC); Antioch, 8 Apr., 1895, A. Eastwood 
(US); Clayton, 17 Apr., 1889, Chesnut & Drew (UC). Alameda 
County: Oakland Hills, 1866, H. N. Bolander 100 (G); Alameda, 
T. S. Brandegee (DS 9589); Livermore Pass, May, 1898, J. B. Davy 
(UC); Cedar Mountain, May, 1903, A. D. E. Elmer 4371 (US, 
NY). San Francisco County: San Francisco, Apr., 1893, I. Tide- 
strom (UC). 
Most, if not all, of these specimens are labeled L. microcarpus 
Sims, though the type sheet bears a correction, by A. A. H., 
changing the determination to L. densiflorus Benth. 
Subvexus, ‘‘sloping upward,” refers to the position assumed by 
the flowers upon withering. 
Key to the varieties of Lupinus subvexus 
Calyx 9-11 mm. long. 
Banner truncate, rounded, or obscurely angled at apex, 
usually 7-8 mm. wide 
Bracts normally reflex-withering as the flower-buds 
open. 
Flowers 14-17 mm. long; calyx 10-11 mm. long; 
leaves not blackening in drying. 4a. typical subvexus. 
Flowers about 14 mm. long; calyx 9 mm. long; 
leaves blackening in drying. 4b. var. nigrescens. 
hering 4c. var. fluviatilis. 
Bracts tar dily or with 
Banner evidently angled at apex, 5—7 mm. wide. 
Wings usually non-ciliate; keel naked below. 
Verticels approximate; plants 8-18 cm. tall, bushy. 4d. var. transmontanus. 
Verticels remote; plants 20—40 cm. tall, with stems 
it hes el ted and fistulous bel 4e. var. Leibergit. 
Wings strongly ciliate near base above; keel ciliate 
4f. var. insularis. 
Calyx 7-8 mm. long; banner 5-6 mm. wide, angled at apex. 
Leaflets 20-40 mm. long, 7-10 mm. wide, green; banner 
Verticels distinct; keel straight. 4g. var. phoeniceus. 
Verticels crowded; keel evidently arcuate. 4i. var. Wilkesit. 
Leaflets 10-20 mm. long, 4-6 mm. wide, conspicuously 
white woolly-villous; banner more slender, 12-14 mm. 
ts 4h. var. albilanatus. 
4b. Lupinus subvexus nigrescens var. nov. [Fic. 8.] 
A L. subvexo typico differt foliolis nigrescentibus cum siccantes; 
pilis brevioribus inconspicuuis; floribus paulo minoribus; labio 
inferiore calycis vix inflato; alis superne ad basin ciliatis. 
