UMBELLIFER^. 327 



acumiuate, entire, or the lowest 3-parted, with their decurrent sometimes 

 coarsely toothed lobes divaricate: umbels naked; rays 1 — 2 in. long: fr. 

 glabrous, 4 lines long by 2 broad: lateral wings narrow, somewhat corky: 

 oil-tubes solitary, or the lateral in pairs : seed nearly plane on the face, 

 channelled under the dorsal oil-tubes. — At Mono Pass in the Sierra, 

 thence southward. 



20. CYMOPTERUS, Rafinesqne. Low perennials, often subacaules- 

 cent, from a fleshy tuberous or fusiform root. Leaves pinnately decom- 

 pound, with small narrow segments. Umbels usually both involucrate 

 and involucellate. Flowers white or yellow. Calyx-teeth minute or 

 distinct. Fruit ovate or elliptical, obtuse or retuse, somewhat flattened 

 dorsally, the lateral ribs and some or all of the others with broad thin 

 wings. Oil-tubes narrow, one or sevex'al in the intervals. Seed dorsally 

 flattened, more or less concave on the face. 



1. C. tereWnthiuus, T. & G. Fl. i. 624 (1840); Hook. Fl. i. 266. t. 95 

 (1833), under Sell mi in. Glabrous, fg — ^}4 ft- high, leafy at base: leaves 

 rather rigid, tripinnate; leaflets linear-oblong, acute, entire or 1 — 2- 

 toothed, barely a line long: rays itnequal, }y£ — 2 in. long; involucre of a 

 single linear leaflet or none; involucels of several short linear bractlets; 

 pedicels 1 — 2 lines long: fl. yellow: fr. 3 — 4 lines long, 2 or 3 broad; 

 calyx-teeth evident; wings rather thin-corky, aline broad; oil-tubes 2 — 4 

 in the intervals, 4 — 10 on the , face. — In the Sierra Nevada, at great 

 elevations. 



2. C. ciuer.arius, Gray, Proc. Am. Acad. vi. 535 (1865). Stemless, 

 from a subterranean creeping rootstock: peduncles (2 — 3 in. high) and 

 petioles glabrous: leaves of cordate outline, bipinnate, the segments 

 toothed, glaucous-cinereous with a fine roughish pubescence : umbellets 

 few, subsessile; involucels of many somewhat united subscarious long- 

 acuminate bractlets: fl. white: fr. I4 in. long; wings narrow, undtilate; 

 oil-tubes 3 in the intervals, several on the face: seed narrow, strongly 

 incurved, showing a deeply concave face. — Habitat of the preceding, but 

 more restricted; Sonora Pass, and above Lake Mono. 



21. OROGENIA, S. Watson. Small subacaulescent perennials, with 

 fusiform or tuberous roots, ternate leaves with linear segments, and 

 white flowers in naked umbels; rays few, very unequal. Calyx-teeth 

 minute. Fruit oblong, slightly flattened laterally. Carpels compressed 

 dorsally, with filiform dorsal and intermediate ribs, the laterals excessively 

 corky-thickened and involute, forming a cavity which is partitioned by a 

 projection from the face of each carpel; oil-tubes 3 in the intervals, 2—4 

 on the face. 



1. 0. fusiformis, Wats. Proc. Am. Acad. xxii. 474 (1887). The stoutish 

 stem 3—6 in. high, from a long fusiform root: leaves 2 — 3-ternate; ter- 



