624 UMBfiLLIFER^. Cymopterus. 



2. C. montanus (Nutt. ! mss. under Phellopterus) : " somewhat s;laucou3 ; 

 leaves bi])innately divided ; segments oblong-linear, rather obtuse ; involucels 

 7-9-parted, membranaceous; the segments oblong, obtuse." 



High bare plains of the Platte, towards the Rocky Mountains, Nuttall ! — 

 Plant 2-3 inches high ; the caudex about an inch long. Leaf with an ovate 

 outline ; the segments rather few and distant. Peduncles shorter than the leaves. 

 Flowers white, nearly sessile in the umbellets, many of them abortive. 

 Involucels nearly as long as the umbellets. Fruit 3i lines long ; the integu- 

 ments thick and opaque, so as to conceal the vittcE : wings rather thin ; the 

 alternal dorsal ones often defective, as in the preceding species : intei-vals 

 with 2-^3 vittae. 



3. C glaums (Nutt.) : " glaucous ; sheaths at the base of the caudex 

 wide and inflated ; leaves bipinnately divided ; the segments crowded, 

 ovate, toothed ; involucels about 3-parted, the segments linear-subulate. — 

 Nutt.! in jour, acncl. Philad. 7. p. 28. Phellopterus glaucus, Nutt..' mss. 



Borders of Flat Head River, towards the sources of the Oregon. Mr. ■ 

 Wyeth! April. — Plant 3-4 inches high. " Root large, descending." Caudex 

 l-2i inches high, usually clothed with large sheathing stipules without 

 leaves ; the summit bearing the leaves and ftowers. Leaves with a some- 

 what cordate outline, about twice the length of the peduncles. Flowers 

 yellowish when dry (probably white in the living state). Fruit not seen. 



§ 3. Calyx-teeth minute : involucels minute : wings of the fruit someivhat 

 thickened and sjmigy, the alternate ones obsolete : commissure uith 6 vittte: 

 carpophore free, 2-parted. — Leptocnemia, Nutt. mss. 



4. C. campestris (Nutt. ! mss. under Leptocnemia) : leaves 3-parted ; the 

 divisions remote, bipinnatifid ; segments oblong. 



Plains of the Platte, near the Rocky Mountains. Nuttall. — " Root tube- 

 rous. Plant about 2 inches high. Caudex one-third of an inch high. 

 Umbel 3-4-rayed. Peduncle scarcely as long as the leaves." — Scarcely 

 differs from some of the smallest specimens of C. glomeratus, except by the 

 broader segments of the leaves, and the free carpophore. 



§ 4. Calyx-teeth distinct, lanceolate: wings of the carpels broad : commissure 

 uith 4-10 vitt^ : carpophore free, 2-parted. — Pteryxia, Nutt. mss. 



5. C. terebinthimis : leaves pinnately decompound, rigid, glaucous ; the 

 segments short, deeply and acutely lobed and toothed ; peduncles elongated ; 

 carpels with 5 perfect wings ; vittse of the commissure 8-10, of the intervals 

 4.— Selinum terebinthinum, Hook. fl. Bor.-Am. 1. p. 266, t. 95. Pteryxia 

 terebinthacea, Nutt. 1 mss. 



Sandy grounds on the Wallawallah River, Oregon, Douglas. Rocky 

 places towards the Blue Mountains, Nuttall! — "Root fusiform, thick, exud- 

 ing a copious turpentine." Dougl. Caudex short, firm, scarcely branched. 

 Leaves 6-8 inches long. Peduncles (in fruit) nearly a foot long. Rays of 

 the unlbel about 10, unequal ; the longest nearly 2 inches in length. " Teeth 

 of the calyx somewhat foliaceous, deciduous." Hook. Fruit oval, about 

 one-third of an inch long : wings thin ; the dorsal about half as broad as the 

 marginal ones. Flowers not seen. 



6. C. fceniculaceus (Nutt. ! mss. under Pteryxia) : " leaves pinnately de- 

 compound ; the segments short and linear, acute ; carpels ^vith 5 perfect 

 wings ; vittae of the commisstire 4-6." 



On rocks. Blue Mountains df Oregon, Nuttall ! — " Less than a foot high. 



