644 



AM.MlAfKAi:. 



Vol. II. 



Musineon Hookeri (Nutt.) T. & G. differs in beiriR Ecalirous. It inhabits the Rocky Mountain 

 region, ranging eastward into South Dakota and westirn Neliraska. 



2. Musineon tenuifolium Xiitt. Scapose Alu.sineon. 

 l-'ig- 3144- 



Mnscniiim teiiiiifoliinn Nutt. ; T. & G. FI. N. A. i : 642. 1840. 

 .IJoriiiin Iciiiiifolimn Kuntze, Rev. Gen. PI. 264. 1891. 



Acaulescent from a woody root, tufted, glabrous, 2'-6' 

 hdgh, pale and somewhat glaucous. Leaves petioled, decom- 

 pound into linear acute incised segments ; scape equalling or 

 slightly exceeding the leaves; umbel i'-i' broad, 5-18-rayed; 

 rays 2"-$" long; flowers greenish white (?); pedicels i"-2" 

 long in fruit; fruit oblong, nearly smooth, about i" long and 

 i" thick, its ribs rather prominent when dry. 



In dry rocky places, South Dakota, Nebraska, and in the Rocky 

 Mountains. June-July. 



29. CYMOPTERUS Raf. Journ. Thys. 89: 100. 1819. 



Perennial subscapose glabrous herbs, with thick roots', pinnately decompound leaves, 

 and white flowers (in our species) in peduncled umbels. Involucre of several bracts or none. 

 Involucels of i to numerous bracts. Calyx-teeth rather prominent. Petals inflexed at the 

 apex. Stylopodium depressed. Fruit globose, ovoid or ellipsoid, flattened laterally or not 

 at all. Carpels dorsally flattened, with 3-5 flat equal wings; oil-tubes several or solitary in 

 the intervals, few or several on the cotnmissural side. [Greek, wave-winged, referring to 

 tlie fruit.] 



About 13 species, natives of western and central North America, the following typical. 



I. Cymopterus acaulis fPtirsh) Rydberg. Plains Cymopterus. Fig. 3145. 



Selinum acaitle Pursh, Fl. Am. Sept. 732. 1814. 



Cymopterus glomeralus Raf. Journ. Phys. 89: too. 1819. 



Cymopterus acaulis Rydberg. Bot. Surv. Neb. 3 : 38. 

 1894. 



Low, the stem seldom over i' high. Leaves erect 



or ascending, bright green, 3'-8' long, slender- 



petioled, pinnate or bipinnate into linear-oblong 



obtuse entire or lobed segments; umbels slender- 



peduncled', compact, i' or less broad, several-rayed; 



rays only i"-2i" long; pedicels very short; involucre 



none; involucel of a single palmately-lobed bractlet; 



fruit broadly oval, about 3" in diameter when 



iTiature ; oil-tubes 4-5 in the intervals ; seed-face 



nearly flat. 



In dry soil. Minnesota, Wi'sconsin and Iowa to Arkan- 

 sas. Assiniboia, British Columbia and Colorado. April- 

 May. 



30. PHELLOPTERUS Nutt.; Coult. & Rose. Contr. U. S. Nat. Herb. 7: 166. 



1900. 



Perennial, nearly or quite acaulescent herbs, with 1-3-pinnate leaves, their segments 

 small, short and broad, the flowers white or purple. Calyx-teeth distinct. Fruit glabrous, 

 ovate to orbicular, each carpel with 3-5 broad thin wings. Stylopodium none. Oil-tubes 

 2 or 3 in each interval, 4-8 on the commissural side. [Greek, referring to the broad wings 

 of the fruit.] 



About 5 species, natives of the central and western United States, the following typical. 



