PEA FAMILY 361 



Jepson, Man. 573 (1925), type loc. Ord Mt., Mohave Desert, Jepson 5877. A. inflexus var. floccu- 

 latus Jepson, Man. I.e., fig. 564, type loe. Hanaupah Canon, Panamint Eange, Jepson 6999. 



25. A. leucolobus Jones. Mountain Loco. Peduncles and leaves caespitose 

 on the branched root-crown, 2 to 5 inches high; herbage hoary throughout with 

 dense soft pubescence; stipules triangular, 2 to 3 lines long; leaves II/2 to 4 inches 

 long; leaflets 11 to 19, obovate to oblong, 2I/2 to 6 lines long; peduncles equaling or 

 exceeding the leaves; racemes rather loosely 3 to 10-flowered, the rachis 3 to 15 lines 

 long; flowers 7 to 8 lines long; calyx-tube densely villous, its teeth triangular-subu- 

 late, 1/4 as long; corolla purple and white; pods narrowly oblong, markedly obcom- 

 pressed, incurved, broadly grooved dorsally, acute to rather long-beaked, densely 

 tomentose, nearly or quite 2-celled except at apex, by intrusion of the dorsal suture, 

 8 to 12 lines long. 



Mountain slopes, 6000 to 8500 feet : Santa Rosa Mts. to the San Bernardino and 

 San Gabriel mountains. IMay-June. 



Field note. — On Le Montaine, north of Big Pines, San Antonio Mts., at 7250 feet. Astragalus 

 leucolobus seems, says Frank W. Peirson, to prefer north slopes and the shade of pines. It often 

 covers tlie ground over considerable areas and the individual plants frequently form mats which 

 are in June or July surrounded by a circle of the deciduous pods. 



Locs. — Santa Eosa Peak, Jepson 1448 ; Fish Creek, San Bernardino Mts., J. Grinnell 34 ; 

 Bear Valley, San Bernardino Mts., Parish 3744, 1813; Le Montaine, San Antonio Mts., Peirson 

 3167 ; Swartout Valley, San Antonio Mts., Munz 4614. 



Var. subvestitus Jepson var. n. Eacemes not exceeding the leaves; flowers 5 to 6 lines 

 long; calyx-tube 21/2 lines long, the teeth about 1 line long; banner and wings narrower than in 

 the species, subequal, both exceeding the keel ; pods ovate or ovate-oblong, shortly pubescent, in- 

 completely 2-celled, the body 3 to 6 lines long, the beak % to 1% lines long; dorsal suture some- 

 what intruded. — (Eacemi folia non superantes; flores lin. 5-6 longi; calycis tubus lin. 2y2 longus, 

 dentibus circiter lin. 1 longis; legumina ovata, breviter pubescentia, lin. 3-6 longa, rostrata, 

 sutura dorsali intrusa in loculos 2 imperfecte divisa.) — Eocky slopes or sandy flats, 4000 to 5000 

 feet : southern Sierra Nevada in Kern and Tulare Cos. 



Locs. — Erskine Creek, Kern Co., Purpus 5098 (type) ; Monatchee Mdws., Tulare Co., Purpus 

 1853. 



Eefs. — Astragalus leucolobus Jones, Zoe 4:270 (1893), type loc. Bear Valley, San Ber- 

 nardino Mts., Parish. Phaca leucoloba Hel. Muhl. 2:85 (1905). Xylophacos leucolobus Eydb. 

 Bull. Torr. Club 52:371 (1925). A. purshii var. leucolobus Jones, Contrib. W. Bot. 10:61 (1902). 

 A. inflexus var. leucolobus Jepson, Man. 573 (1925). Var. subvestitus Jepson. 



26. A. newberryi Gray. Silk Loco. Peduncles and leaves densely congested 

 on the short stems of the branched root-crown, II/2 to 5 inches high; herbage densely 

 white-silky, the hairs appressed; leaves 1 to 2% inches long; petioles usually ex- 

 ceeding the rachis; leaflets 5 to 11, elliptic- to oblong-obovate, 3 to 6 lines long; 

 peduncles sometimes exceeding the leaves; racemes short or capitate, (1 or) 2 to 

 7-flowered, the rachis 1 to 3 lines long; flowers 10 to 12 lines long; calyx-tube white- 

 or black-hairy, 3 to 5 lines long, the linear or subulate teeth 1 to 2 lines long, some- 

 times blackish; corolla purple; pods oblong to ovate-oblong, obcompressed, arcu- 

 ate, shaggy- villous, 1-celled, 7 to 11 lines long, the dorsal suture either not at all 

 intruded or deeply so. 



Rocky slopes, 3800 to 5000 feet: eastern ]\Iohave Desert; Inyo Co. East to 

 Utah and New Mexico. Apr.-May (fl. and fr.). 



Field note. — The peduncles curve sickle-like in age, and then reflex. They become indurated 

 and persist for several years, often forming on the bases of the root-crown branches a loose thatch. 



Locs. — Barnwell, e. Mohave Desert, Parish 9659; Leastalk, New York Mts., Parish 10,311; 

 Providence Mts., I. Brandegee (dorsal suture of pod deeply intruded). At the following Inyo 

 Co. stations the plants are in pubescence somewhat intermediate towards A. purshii Dougl. : 

 Keeler, T. Brandegee ; Owens Valley, T. Brandegee ; Olancha, T. Brandegee. 



Var. castoreus Jones. Habit more open; peduncles 2 to 5 inches long; calyx more or less 

 black-hairy, its teeth IV^ to 1% lines long. — ^White Mts. (Black Canon at Marble Fork, 5900 feet, 

 Buran 2723) ; New York Mts. (Barnwell, Parish 10,424). East to Utah. 



Eefs. — Astragalus newberryi Gray, Proc. Am. Acad. 12:55 (1876), type loc. "frontiers of 

 Utah and Arizona," Newberry. A. chamaeleuce Gray, Bot. Ives 10 (1860), as to the plant of 



