t.kxiopledrum. UMBELLIFE RJE. 269 



HYDROCOTYLE. 



33 T.ENIOPLEURUM C. & R. Bot. Gaz. Nov. 1889. 



Smooth erect herbs, from a fascicle of thickened fibers, with 

 .ternate-pinnate leaves, toothed leaflets, involucre and involucels 

 of numerous conspicuous bracts and white flowers. Calyx-lobes 

 prominent. Fruit oblong, glabrous flattened latterly. Carpel with 

 broad, salient ribs. Stylopodium prominent and conical. Oil- 

 tubes solitary in the intervals, very large, two on the commis- 

 sure. Seeds dorsally flattened, sulcate beneath the oil-tubes, 

 becoming loose in the pericarp, and invested by a layer of secret- 

 ing cells. 



T. Howellii C & R. I.e. Stems rather stout, 3-4 feet high, leaves 

 few, ternate then once or twice pinnate; leaflets lanceolate to ovate, 

 strongly toothed or lobed; umbels many-rayed, with involucre of long nar- 

 rowly oblanceolate bracts and involucels of prominent lanceolate scarious- 

 margined bractlets ; ray 1-3 inches long; padicels 3-5 lines long. Wet 

 places Grants Pass, Oregon. 



34 OICUTA L. Gen. n. 354. 



Tall branching glabrous perennial herbs with pinnately or 

 ternately compound leaves, involucre small or wanting, involu- 

 cels of several small bractlets and many-rayed umbels of small 

 flowers. Calyx-lobes rather prominent. Fruit oblong to nearly 

 orbicular, glabrous. Stylopodium conical. Carpels with strong 

 flattish corky ribs, the laterals the largest. Seed nearly terete, 

 or somewhat dorsally flattened, with plane face. Oil-tubes soli- 

 tary in the intervals, 2 on the commissure. 



C. occjdeiitalis Greene Pitt, ii, 7. Stem stout, 3-6 feet high, green, 

 scarcely glaucous, paniculate from toward the base: leaves bipinnate; leaf- 

 lets 2-3 inches long, narrowly lanceolate, coarsely serrate : umbel many- 

 rayed; involucre usually wanting; involucels of few narrow lanceolate 

 bractlets : rays 1-4 inches long ; pedicels 2-4 lines long : fruit broadly ovate 

 to oval, the lateral ribs much larger than the others: oil-tubes broad and 

 conspicuous, the commissural pair contiguous. In marshes and wet 

 places. Alaska to California and the Rocky Mountains. 



C. purpurata Greene 1. c. 8. Stems 3-4 feet high, purple glaucous, con- 

 spicuously striate, paniculate from the middle: leaves bipinnate; leaflets 

 ovate-lanceolate, 1-2 inches long closely and often deeply serrate, the teeth 

 a little falcate; umbels many, long peduncied : involucre and involucels 

 wanting or deciduous : flowers dull and inconspicuous : fruit orbicular, ribs 

 of the carpels broad and low: oil-tubes small. Springy and boggy places 

 near CleElum, Washington. 



C. vagaiis Greene 1. c. Stem branching froin the very base, the 

 branches diffuse or reclining, 3-5 feet long, abundantly floriferous : herbage 

 purplish or glaucous : radical leaves 2 feet long bi- or tri-pinnate ; leaflets 

 2 inches long, lanceolate, somewhat cuneate below and entire, but from 

 below the middle bearing rather remote short but salient serrate teeth : 

 flowers dull, fruit orbicular ; the ribs very broad and low; oil-tube small, 

 cross-section of seed nearly reniform. Borders of Lake Pend d'Oreille, Idaho. 



35 HYDROCOTYLE Tourn. 



Low perennial herbs growing in water or wet places with slen- 



