t-KNiopLEDRUM. UMBELLIFERiE. £69 



HYDROCOTYLB. 



33 TJiNIOPLEURUM 0. & 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. Fruitoblong, 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 & B. 1. e. Stems rather stout, 3-4 feet high, leaves 

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

 fitrongly 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; pedicels 3-5 lines long. Wet 

 places Grants Pass, Oregon. 



34 CIOUTA 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. occidentalis 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. purpnrata 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 peduncled : involucre and involucels 

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

 ■of the carpels broad a,nd low : oil-tubes small. Springy and boggy places 

 near Cle Elum, Washington. 



C. vagaus Greene 1. c. Stem branching from 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 ciineate 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 renif orm. Borders of Lake Pend d'Oreille, Idaho. 



35 HYDROCOTYLB Tourn. 



Low perennial- herbs growing in water or wet. places with sleii- 



