CARROT FAMILY 617 



2. O. Bakeri Coult. & Rose. Leaves 2-7 cm. long, glabrous; leaflets divided 

 into 3-5 linear or linear-lanceolate lobes; peduncles 3-8 cm. long; fruit 3-4 mm. 

 long; oil-tubes 2-5 in the intervals. High mountain peaks: Colo. — Utah. 

 Subalp. — Alp. Jl-Au. 



3. O. alpina (A. Gray) Coult. & Rose. Leaves pale green, 2-7 cm. long; 

 leaflets divided into 1-7 linear divisions; peduncles 2-8 cm. long, puberulent or 

 sometimes nearly glabrous; bractlets usually narrowly lanceolate, more or less 

 united at the base; flowers pale yellow or nearly white; fruit 4-5 mm. long, 

 puberulent, at least when young. Cymoplerus alpinus A. Gray. High mountain 

 peaks: Colo. — Utah. Subalp. — Alj}. Jl-Au. 



4. O. MacDougali (Coult. & Rose) Rydb. Leaves 5-15 cm. long; leaflets 

 3-7, obovate, ovate, or cuneate in outline, with 2-5 coarse teeth; peduncles 1-1.5 

 dm. long, glabrous; bractlets few, linear; flowers yellow; fruit oblong, ret use at 

 each end, 6-7 mm. long. Alete.s MacDougali Coult. & Rose. Canons: n Ariz. 

 — s Utah. Son. Je-Jl. 



21. HARBOURIA Coult. & Rose. 



Glabrous cespitose perennials, with few-leaved stems and woody caudex. 

 Leaves ternately decompound, with narrowly linear or filiform divisions. Flow- 

 ers yellow, in long-peduncled umbels. Bracts and bractlets few, subulate. 

 Calyx-teeth evident. Stylopodium depressed or wanting. Fruit ovate, flattened 

 lateraUy, with narrow commissure, tuberculate-roughened. Ribs broad, obtuse, 

 prominent. Oil-tubes large, solitary in each interval, 2 on the commissural 

 side. Seed nearly round in cross-section. 



1. H. trachypleura (A. Gray) Coult. & Rose. Stem 3-6 dm. high, glabrous; 

 leaves several times ternately decompound into filiform, mucronulate divisions; 

 umbels 15-25-rayed; flowers yellow; fruit broadly ovate, 4 mm. long. Cicuta 

 trachypleura A. Gray. Mountains: Colo. — Wyo. Submont. — Mont. My-Jl. 



22. SiUM (Tourn.) L. Water Parsnip. 



Smooth caulescent perennials, with rootstocks, growing in water or wet 

 places. Leaves pinnate, with serrate or pinnatifid leaflets. Flowers white in 

 large umbels. Bract and bractlets numerous, narrow. Calyx-teeth minute. 

 Stylopodium depressed; styles short, recurved. Fruit flattened laterally, oval 

 in outline, glabrous. Ribs equal, prominent and corky. Oil-tubes 1-3 in each 

 interval, 2-6 on the commissural side. Seed not compressed; face plane. 



1. S. cicutaefolium Gmel. Stem 6-10 dm. high; leaves pinnate, with 

 7-17 leaflets, or if growing in water the submerged leaves twice or thrice pinnatifid; 

 leaflets in the emersed leaves linear or lanceolate, 3-10 cm. long, sharply serrate; 

 fruit 3 mm. long, with prominent ribs. Water and wet places: Newf. — Va. — 

 Cahf.— B.C. Plain— Mont. Je-Au. 



23. CICUTA L. Cow Bane, Poison or Water Hemlock. 



Smooth poisonous marsh plants, with short often erect rootstock and leafy 

 stems. Leaves pinnate or bipinnate, with serrate leaflets. Flowers white, in 

 compound umbels. Bracts few or none. Bractlets several and slender. Calyx- 

 teeth rather prominent. Stylopodium low, but sometimes low-conic. Fruit 

 oblong to orbicular, flattened laterally, glabrous. Ribs strong, corky, flattish, 

 the lateral ones largest. Oil-tubes solitary in the intervals, 2 on the commissure. 

 Seed-face plane or nearly so. 



Axils of the leaves not bearing bulblets; leaflets lanceolate. 



Bractlets scarious-margined. 1. C. cinicola. 



Bractlets not scarious. 



Fruit orbicular in outline; rootstock usually horizontal or ascending. 



2. C. vagans. 

 Fruit oval in outline; rootstock exceedingly short, erect. 3. C. occidentalis. 



Axils of the leaves (especially the upper ones) bearing bulblets; leaflets narrowly linear. 



4. C. hulbifera. 



1. C. cinicola A. Nels. Stem stout, 2 m. high; lower leaves bipinnate, 

 with some of the larger pinnae bifoUolate; leaflets ovate or broadly lanceolate. 



