CATALOGUE. 129 



Var. ALPiNUM. Dwarf; leaves 3' long, with dilated scarious bases, 

 mostly simply pinnate with 3-5 pairs of leaflets ; stems 4-6' high, with a 

 3-6-rayed umbel, occasionally subtended by a single involucral bract; fruit 

 2-3" long, the margins rather thin and the dorsal ribs either filiform or 

 nearly as prominent as in an Angelica ; vittse very obscure, 1-2 in the inter- 

 vals, 4-6 on the commissure. — East Humboldt Mountains, Nevada; 9,000 

 feet altitude. (464.) 



Peucedanum simplex, Nutt. MSS., (in Herb. Gray.) Acaulescent, 

 puberulent and glaucous ; leaves sheathing at base, pinnate or occasionally 

 bipinnate, the leaflets about 2 pairs, linear or linear-lanceolate, elongated 

 (2-4' long;) scapes 6-18' high, slender, exceeding the leaves, with very 

 rarely a petioled leaf in the middle, bearing a single 5-15-rayed umbel; bracts 

 of the involucel usually numerous, lanceolate or setaceous ; flowers yellow ; 

 calyx-teeth obsolete ; fruit large, 3-6" long and 2-5" broad, somewhat emar- 

 ginate at each extremity, the thin submembranous wing nearly as wide as 

 the seed and with a vein-like margin ; the dorsal ribs slightly prominent ; 

 vittse broad and solitary ; the seed thin and much flattened. — Identical with 

 Nuttall's original specimens ; collected by him in the Rocky Mountains, also 

 by Sitgreave in Northwestern Arizona, (P. triternatum, var. platycarpum, 

 Torr.,) and found more recently in Montana. Rather frequent on the foot- 

 hills of the Wahsatch ; 5-6,000 feet altitude ; May-July. (465.) 



Peucedanum millefolium. Acaulescent, glabrous; leaves ternate- 

 pinnately decompound, the ultimate segments linear, cuspidate, very numer- 

 ous; scapes 12-18' high, with a single umbel of 6-12 fertile nearly equal 

 rays, 1-3' long, the wholly sterile rays numerous and shorter ; involucre 

 none; involucel of 8-12 linear-subulate bracts, not unilateral; calyx-teeth 

 small; petals (apparently white) with a narrowly attenuated point; fruit 

 large, 4-6" long and 3-4" broad, about equaling the raylets, somewhat cordate 

 at base, the thin submembranous wing more than half as broad as the seed, 

 the dorsal ribs slightly prominent ; vittse conspicuous and solitary, a central 

 pair in the commissure with a more or less prominent mid-rib between ; seed 

 thin, somewhat concave. — Resembling P. fosniculaceum, but taller, glabrous, 

 the fruit 2-3 times larger, with fewer vittee. Antelope Island, Salt Lake ; in 

 ft nit, June. (466.) 



Peucedanum bicoloe. Caulescent or scarcely so, glabrous or slightly 

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