24G LEQUMINOSAE 



(1925). r. arpcntata Greene, Erythea 3:18 (1895), type loc. Modoc Co. (Egg Flat, Forest- 

 dale), 3/. .S. Baler. Var. semota Jcpson. T. gracilis var. vcJuiina Jcpson, Man. 515 (1925), in 

 great part. 



10. PICKERING! A Nutt. 



Very ri<,'id and spiny ever<:rcon xeropliytic shrub. Leaves small, palmately 

 1 to 3-foliolate, nearly sessile and without stipules. Flowers large, purple, solitary, 

 axillary and short-pediceled. Calyx campanulate with a turbinate base, the border 

 with 5 Very low broad teeth. Petals equal, the banner orbicular with reflexed sides, 

 the wing- and keel-petals oblong, the latter distinct and straight. Stamens dis- 

 tinct. Pod linear, flat, stipitate, straight, several-seeded. — Species 1. (Charles 

 Pickering of the Wilkes Expedition, which visited California in 1841.) 



1. P. montana Nutt. Pea Chaparral. Densely branched shrub 3 to 10 feet 

 high, the branchlets very spinose; leaflets obovate, entire, 2 to 6 lines long; flowers 

 near the ends of the branchlets, rose-purple, % inch long, on very short pedicels; 

 pedicels bearing 2 minute subulate bractlets near the middle; banner with a yel- 

 lowish or whitish spot at base; stamens persistent; pods exserted on the stipes, 

 about 2 inches long, 6 to 10-seeded, somewhat constricted betw^een the seeds. 



Dry rocky mountain slopes, 1000 to 5000 feet : common from Mendocino Co. 

 to Monterey Co.; thence south to San Diego Co., infrequent or rare; Sierra Nevada 

 from Butte Co. to Nevada Co., highly localized. IMay-June. 



Biol. note. — This species, one of the most xerophytic types of shrubs of the chaparral forma- 

 tion, often flowers abundantly but fruits very sparingly, mature pods usually being a rarity. The 

 shrub crown-sprouts from the root-crown after a chaparral fire, but not ordinarily from the 

 trunk-stem. Leafy shoots are also developed from the roots whenever these are exposed by 

 being uncovered, as on a landslip, or road or trail. Shrubs with albino flowers have been observed 

 near Santa Rosa (Grace Elmore) and on Greninger Creek in the Santa Cruz Mts. (Jepson 9692). 

 In the latter case the shrubs grew on a graded cut in the hills and undoubtedly arose from the 

 mutilated root system of older plants. The bank above the cut was crowned with a thicket of 

 the same species, the flowers deep red. 



Locs. — Coast Eanges: Indian Valley, ne. Lake. Co., Jepson 9024; Miyakma Eange (e. of 

 Ukiah), Jepson 2249; betw. Adams Sprs. and Glenbrook, Jepson; Knoxville ridge, Jepson; 

 Yaca Mts., Jepson 13,586; Mt. St. Helena (Erythea 7:107) ; Eebecca ranch grade sw. of Calis- 

 toga, Jepson; Howell Mt., Jepson 2439; Mt. Tamalpais, Jepson 5712, 6189; Moraga Ridge, 

 Oakland Hills, Jepson; Donner Canon, Mt. Diablo, Jepson 7574; Los Gatos, ridge w., Keller 

 7426; Greninger Creek, w. of Gilroy, Jepson 9692; Pajaro Hills, Chandler 379; Arroyo Hondo 

 traU, Santa Lucia Mts., Jepson; San Luis Obispo, L. E. Eoadhouse. Sierra Nevada: Sugarloaf 

 Mt., Nevada City, Knower Mills; You Bet, w. of Dutch Flat, ace. L. S. Smith. S. Cal.: Santa 

 Inez Mts. (Bull. N. Y. Bot. Card. 6:389); Santa Cruz Isl. (Zoe 1:134); Laurel Canon, Los 

 Angeles (Proc. S. Cal. Acad. 1:8) ; City Creek road, San Bernardino Mts., Parish 4909. 



Var. tomentosa Jtn. Herbage densely puberulent. — Mountains of eastern San Diego Co.: 

 Jamul, Palmer; Dulzura, Valentine ; El Nido, Abrams 3530. 



Eefs. — PiCKERiNGiA MONTANA Nutt. ; T. & G. Fl. 1:389 (1840), type loc. summits of moun- 

 tains near Santa Barbara, Nuttall; Jepson, Fl. W. Mid. Cal. ed. 2, 215 (1911), Man. 515, fig. 517 

 (1925). Xylothermia montana Greene, Pitt. 2:188 (1891) ; Jepson, Fl. W. Mid. Cal. 290 (1901). 

 Var. TOMENTOSA Jtn. Contrib. Gray Herb. 08 :84 (1923). Xylothermia montana subsp. tomentosa 

 Abrams, Bull. Torr. Club 34:263 (1907), type loc. near El Nido, San Diego Co., Abrams 3530. 



11. LUPINUS L. Lupine 



Herbs or shrubs. Leaves palmately compound; leaflets 3 to 17. Flowers 

 showy, blue, pinkish, yellow or white, in terminal racemes or spikes. Calyx deeply 

 2-lipped, often with small bractlets between the lips. Banner commonly with a 

 median groove, the sides mostly reflexed ; wings commonly connivent by their edges 

 in front of and thus enclosing the mostly falcate pointed keel. Stamens mona- 

 delphous, dimorphous, 5 with longer and basifixed anthers, the alternate 5 with 

 shorter and versatile ones. Pod somewhat flattened, often constricted between the 

 seeds. Cotyledons thick and fleshy. — Species about 100, all continents except 

 Australia, mostly North America. (Latin lupus, a wolf, these plants anciently 

 thought to rob the soil of its fertility. ) 



