624 UMBELLIFERAE 



Refs. — LiGUSTicuM qrayi C. & R. Rev. N. Am. Umbell. 88 (1888), based on L. apiifolium var. 

 viinus Grav; B. & W. Bot. Cal. 1 :i2G4 (187G),typc loc. Ostrandcr's Mdw8.,n('ar Yoscmite, Bolander 

 6341, and Ebbctts Pass, Alpine Co., Brewer 2082; Jcpson, Man. 713, fig. 696 (1925). L. cusickii 

 C. & R. Contrib. U. S. Nat. Herb. 7:138 (1900), type loc. higher mts. of c. Ore., Cusick 1799. L. 

 pringlci C. & R. I.e., type loc. Siskiyou Co., Pringle 19. 



12. PODISTERA Wats. 



Dwarf perennials, the stems short and shortly branched, forming a mat-like 

 plant. Leaves once or twice pinnatoly parted. Umbels compound but very much 

 condensed. Involucre none. Involucels of 3 to 5-cleft green bractlets. Flowers 

 white or pinkish. Calyx-teeth prominent. Styles ribbon-like. Fruit flattened 

 laterally, elliptic-ovate. Ribs slender. Oil-tubes 2 or 3 in the intervals, 6 on the 

 commissure. — Species 2, California. (Greek podos, foot, and stereos, solid, refer- 

 ring to the compactly involved pedicels and involucels. ) 



Leaves pinnately parted 1. P. nevadensis. 



Leaves bipinnately parted 2. P. albensis. 



1. P. nevadensis "Wats. Peduncles arising from the short crowded branches, 

 % to lYo inches high; herbage obscurely puberulent; leaves pinnately parted, 4 to 

 9 lines long, the 5 to 7 segments narrowly oblong, acute, entire, 1 to 3 lines long, 

 the petioles with membranous sheaths; flowers yellow; umbels very much con- 

 densed; fruit 1 to 11,4 lines long. 



Alpine summits, 11,600 to 13,000 feet: Sierra Nevada in Tuolumne and Mono 

 Cos. July. 



Field note. — Podistera nevadensis is an inhabitant of the high peaks and slopes of the 

 easterly crests of the Sierra Nevada in Tuolumne and Mono counties: Mt. Gibbs, Mt. Dana 

 (Jepson 3291) and Mt. Warren (Congdon), mostly within the limits of an 800-foot zone. The 

 plants form closely woven circular mats often one foot in diameter, with the flowers scarcely 

 rising above the foliage. It is also reported from Sugarloaf in the San Bernardino Mts. (Ann. 

 Mo. Bot. Gard. 17:254). 



Refs. — Podistera nevadensis Wats. Proc. Am. Acad. 22:475 (1887); Jepson, Man. 714 

 (1925). Cymopterus nevadensis Gray, Proc. Am. Acad. 6:536 (1865), type loc. Mt. Dana, 

 Brewer. 



2. P. albensis Jepson. Similar to no. 1; plants 1 to 2^/4 inches high; leaves 

 bipinnatifid, the oblong segments 1 to 2 lines long. 



Rocky slopes, 7000 to 8000 feet : White Mts. 



Refs. — Podistera alben.sis Jepson, Madrono 1:140 (1923), type loc. White Mts., Purpus 

 5831; Jepson, Man. 714 (1925). 



13. OREONANA Jepson 



Low tufted grayish plants, the peduncles and leaves from the crown of a stout 

 taproot. Herbage woolly or roughish-pubescent. Leaves temately compound 

 and finely dissected, the segments crowded, callous-margined and cuspidate. Flow- 

 ers white, in compound umbels, the umbels much condensed or capitate. Rays 

 about 10 to 15. Calyx-teeth present, often conspicuous. Involucre none. Involu- 

 cels unilateral. Fruit broadly elliptic or orbicular, somewhat laterally compressed, 

 sessile. Ribs filiform. Sterile flowers on filament-like pedicels which are longer 

 than the rays. Oil-tubes 3 to 5 in the intervals, 3 or 4 or 6 on the commissure. — 

 Species 2, California. (Greek oreos, mountain, and nannos, dwarf, these plants 

 very small as compared with the Velaeas from which they are separated.) 



Bays membranously winged and web-footed; sterile pedicels equaling or little exceeding the fruit; 



calyx-teeth of sterile flowers very conspicuous, star-like 1. 0. dementis. 



Rays not winged ; sterile pedicels greatly exceeding the fruit ; calyx-teeth inconspicuous 



2. 0. vestita. 



1. 0. dementis Jepson. Pigmy Parsnip. Plants 1 to 3 inches high; peduncles 

 ascending, from the scaly winter-buds of the root-crown ; blades, pedicels and fruits 



