632 UMBELLIFERAE 



Var. heterophyllum Jcpson. Lowest leaves with long fistulous petioles, the blades simple or 

 few pinnate. — Marshes in tlio Groat Valley: Suiaun MarHhos, Jepson 24G0e ; Stockton, Greene. 



Refs. — SiUM CICUTAEFOLIUM Schrank," Buicr. Fl. 1:588 (1789); Jepson, Man. 712, fig. 694 

 (1925). Var. hktkkophyllum Jepson, Fl. W. Mid. Cal. 353 (1901), ed. 2. 297 (1911), Man. 712 

 (1925). S. hcterophyllum Greene, Pitt. 2:102 (1890), type loc. Suisun Marshes, Greene. 



2]. OROGENIA Wats. 



Dwarf frlabrous perennial lierbs with flesliy roots. Stems from the root-crown 

 1 to 4, very short, mostly iinderfrround, sheathed by larpre scarious bracts. Leaves 

 basal, ternate or biternate, with linear segments. Involucre none. Involucels of 

 few linear bractlets. Flowers Avhite, in compound umbels, the rays very unequal. 

 Fruit oblong, only slightly flattened laterally. Carpels flattened dorsally; dorsal 

 and intermediate ribs filiform; lateral ribs strongly corky-thickened, extended 

 towards the companion carpel so as to leave a large central cavity which is di- 

 vided longitudinally by a thick corky ridge from the middle of each face. Oil- 

 tubes small, 3 in the intervals, 2 to 4 on the commissure. — Species 2, western North 

 America. (Greek ores, mountain, and genos, race, referring to the habitat.) 



1. 0. fusiformis Wats. Plants 3 to 4 inches high, arising from a long fusi- 

 form root; leaf -segments I/2 to 2^/2 inches long; umbels 2 to lO-rayed; rays 1 to 11 

 lines long ; umbellets capitate, 2 to 214 lines wide ; fruit about 3 lines long. 



Wet sandy soil, 4000 to 5500 feet : east side or easterly valleys of the Sierra 

 Nevada from Nevada Co. to Plumas Co. North to Oregon. Apr., fr. July-Aug. 



Locs. — Koad to Donner Lake near Truckee, Sonne; Prosser Creek, Nevada Co., Sonne. Ore.: 

 Ashland Butte, CiisicTc 2892. 



Refs. — Orogexia fusiformis Wats. Proc. Am. Acad. 22:474 (1887), type loc. Plumas Co., 

 B. M. Austin; Jepson, Man. 712 (1925). 



22. HERACLEUM L. 



Tall perennials with stout stems from thick horizontal rootstocks. Leaves very 

 large, ternately compound, with broad sheathing petioles. Flowers white, in a 

 large many-rayed compound umbel. Involucre deciduous. Involucels of nu- 

 merous bractlets. Petals obcordate, the marginal ones of the umbel much larger. 

 Fruit almost orbicular, strongly compressed. Lateral ribs with a thin wing; dor- 

 sal and intermediate ribs filiform. Oil-tubes 2 on the commissure, 1 in each in- 

 terval, visible from the outside and reaching from the summit to about the middle 

 of the carpels. — Species 60, Europe, Asia and north Africa, 1 species in North 

 America. (Named for Hercules, who, it is said, first used it in medicine.) 



1. H. lanatum Michx. Cow Parsnip. Plants 4 to 7 feet high; leaflets 3, 

 petiolulate, ovate or orbicular, sharply serrate and lobed, 3 to 6 inches broad; 

 umbels 6 to 10 inches broad; fruit 3^/2 to 5 lines long. 



Brushy canon sides or north slopes in the hills, 5 to 8000 feet : San Jacinto and 

 San Bernardino mountains; Coast Ranges from Monterey Co. to Humboldt Co., 

 usually near the sea; Sierra Nevada from Fresno Co. to Modoc Co. North to 

 Alaska, east to the Atlantic. Apr., fr. Aug. 



Locs. — Coastal S. Cal.: San Jacinto Mts. (Univ. Cal. Publ. Bot. 1:98) ; Little Bear Valley, 

 San Bernardino Mts., Parish 1668. Sierra Nevada: Simpson Mdw., Middle Fork Kings Eiver, 

 Henrietta Eliot; Ward Lake, South Fork San Joaquin River, Jepson 16,079; Bench Mdw., Kaiser 

 Ridge, Jepson; Kennedy Lake, Tuolumne Co., A. L. Grant 240; Dorrington, Calaveras Co., Jep- 

 son; Mt. Tallac, C. J. Fox; Jonesville, Butte Co., Copeland; Ft. Bidwell, Manning. Coast Ranges : 

 Monterey, Jepson; Half moon Bay, San Mateo Co., Jepson; Mt. Davidson, San Francisco, Jepson; 

 Oakland Hills, Jepson 5716; Berkeley Hills, Jepson 14,236; Sycamore Canon, Mt. Diablo, Jepson; 

 Inverness, Marin Co., Jepson; Carlotta, Humboldt Co., Tracy 4511; Burnt Ranch, Trinity Co., 

 Tracy 6407. 



Refs. — Heracleum lanatum Michx. Fl. Bor. Am. 1:166 (1803), type from Canada; C. & R. 

 Contrib. U. S. Nat. Herb. 7:248, fig. 64 (1900) ; Jepson, Fl. W. Mid. Cal. 360 (1901), ed. 2, 304 

 (1911), Man. 717, fig. 702 (1925). 



