PEA FAMILY 483 



solitary, subsessile, showy, purple. Calyx campanulate, repandly 5-toothed. Petals equal 

 in length ; standard orbicular, with reflexed sides ; keel petals distinct, oblong, obtuse. 

 Stamens with distinct filaments. Pod linear, straight, compressed, several-seeded. [Name 

 in honor of Charles Pickering, of the Wilkes Exploring Expedition.] 



A monotypic California genus. 



1. Pickeringia montana Nutt. Stingaree-bush, Chaparral Pea. Fig. 2559. 



Pickeringia montana Nutt. in Torr. & Gray, Fl. N. Amer. 1 : 389. 1840. 

 Xylothermia montana Greene, Pittonia 2: 188. 1891. 



Shrub with stiff widely spreading branches, 1-3 m. high, the branchlets spinescent, sparsely 

 puberulent or glabrous, olive-green. Leaves rather crowded, glabrous or nearly so; leaflets 

 oblanceolate to obovate, 8-15 mm. long, entire, pale green, firm; calyx about 6 mm. long; petals 

 15-20 mm. long, reddish purple. 



Dry chaparral ridges, Transition and Upper Sonoran Zones; central California from Sonoma and Mariposa 

 Counties south to southern California. Type locality: summits of the mountains in the vicinity of Santa Barbara. 

 May-July. 



Pickeringia montana subsp. tomentdsa Abrams {Xylothermia montana subsp. tomentosa Abrams, Bull. Tor- 

 rey Club 34: 263. 1907). Young twigs and leaves canescent. The common form from the San Bernardino 

 Mountains, California, to northern Lower California. Type locality: El Nido, San Diego County, California. 



3. LUPINUS* L. Sp. PL 721. 1753. 



Annual, biennial, or perennial herbs or shrubs, 5-240 cm. tall. Leaves alternate, pal- 

 mately compound or rarely unifoliolate; petioles short or much elongated, dilated at base, 

 stipulate; leaflets usually 5-17, rarely 3 or 4. Flowers 5-20 mm. long, racemose, the 

 pedicels 1—12 mm. long. Calyx bilabiate, the lips entire, toothed, or the upper bifid, often 

 with interstitial bracteoles. Banner commonly with a ventral median sulcus, a pair of 

 rounded umboes near the center, the sides commonly reflexed, the back glabrous or more 

 or less pubescent ; wings usually glabrous ; keel arcuate or nearly straight along the upper 

 edges, often ciliate along the upper margins, sometimes also on the lower edges near 

 claws. Stamens 10, monadelphous, the anthers alternately of two forms, elongated and 

 short. Pistil of one carpel, becoming a flattened legume; ovules 2-12. Seeds with a 

 sunken hilum, which is often thus surrounded by a thickened ring. [Latin, from Lupus, 

 a wolf, because of an erroneous impression that these plants rob the soil.] 



A genus of perhaps 200 species, mostly of North and South America, where particularly abundant in the 

 western mountains, but also represented by a few annuals in the Mediterranean region of the Old World. Type 

 species, Lupinus albus L. 



Cotyledons sessile, perfoliate; ovules usually two only; annuals. 



Flowers verticillate; keel ciliate on the upper margins near claws, sometimes also below. 



A. Microcarpi. 



Flowers non- verticillate; keel non-ciliate. B. Pusilli. 



Cotyledons petioled after germination; ovules two to twelve or more. 

 Plants annual or biennial. 

 Flowers verticillate. 



Keel ciliate on both upper and lower margins, near the claws. E. Succulenti. 



Keel ciliate on the upper margins only and near apex, or non-ciliate. G. Micranthi. 



Flowers non-verticillate. 



Keel non-ciliate. C. Concinni. 



Keel ciliate on lower margins near claws and also often on the upper margins. 



Racemes longer than their peduncles. F. Sparsiflori. 



Racemes shorter than their peduncles. D. Stiversiani. 



Plants perennial. 



Keel ciliate between middle and claws, but not between middle and apex. O. Latifolii. 



Keel ciliate between middle and apex, or non-ciliate. 



Apex of banner normally not much reflexed from upper margin of wings; ventral median sulcus of 

 banner deep, including considerable of the wings. 



Pedicels short and stout, usually less than 3 mm. long; banner pubescent on the back. 



K. Leucophylli. 



Pedicels slender, usually 3-12 mm. long. I. Calcarati. 



Apex of banner normally well reflexed from upper margins of wings; ventral median sulcus of 

 banner usually shallow, including very little of the wings. 

 Upper calyx-lip entire, emarginate, or bidentate. 



Calyx-cup strongly spurred above pedicel. I. Calcarati. 



Calyx-cup subsymmetrical, sometimes slightly gibbous but not spurred. 

 Stems without long-petioled lower leaves at flowering time. 



Keel non-ciliate. N. Albicaules. 



Keel more or less ciliate on upper edges. M. Arborei. 



Stems with some long-petioled lower leaves at flowering times. 



Leaves largely basal and long-petioled, the stems usually stout and fistulous, few- 

 leaved. 

 Keel non-ciliate. P. Polyphylli. 



Keel ciliate on upper edges. Q. Saxosi. 



Leaves many, the upper cauline well developed. 



Banner more or less pubescent on the back. L. Sericei. 



Banner glabrous and leaves usually greenish above. M. Arborei. 



* Text of the genus Lupinus contributed by Charles Piper Smith. 



