52? 



VOL. II.] CARROT FAMILY. 



i. Apiastrum patens (Nutt.) Coult. & Rose. 

 Spreading Apiastrum. (Fig. 2672.) 



Leptocaulis patens Nutt. ; DC. Prodr. 4: 107. 1830. 

 Apium patens S. Wats. Bibl. Index, i: 413. 1878. 

 Apiastrum patens Coult. & Rose, Rev. no. 1888. 



Erect, slender, i-2 high, divergently branched above. 

 Stem-leaves short-petioled, biternately dissected into 

 narrowly linear or filiform segments; umbels terminal, or 

 axillary, J^'-i,^' broad; rays3 // -6 // long; pedicels i^"- 

 i" long in fruit; fruit ovate, slightly more than Ji'Mong, 

 more or less tuberculate, usually densely so. 



Nebraska and Missouri to Texas and New Mexico. June. 



24. MUSINEON Raf. Journ. Phys. 91: 71. 1820. 



[ADORIUM Raf. Neog. 3. 1825.] 

 [MUSENIUM Nutt; T. & G. Fl. N. A. i: 642. 1840.] 



Low perennial resiniferous herbs, branching or acaulescent, with pinnately decompound 

 leaves, and compound umbels of yellow or white flowers. Involucre none. Bracts of the 

 involucels few, narrow. Calyx-teeth ovate. Petals clawed, the apex long and infolded. 

 Stylopodium small, depressed. Fruit ovate or ovate-oblong, slightly compressed laterally, 

 smooth or nearly so in our species (roughened in M. trachyspermum.) Carpels somewhat 

 5-angled, the ribs filiform, equal; oil-tubes usually 3 in the intervals, the middle one 

 usually largest. Seed-face concave. [A name of fennel.] 



Three known species, natives of northwestern and central North America. 



Stem leafy, branching; fruit about 2" long. i. A. divaricatum. 



Plant acaulescent, tufted; fruit about i" long. 2. A, tenuifolium. 



i. Musineon divaricatum (Pursh) Nutt. 

 Leafy Musineon. (Fig. 2673.) 



Seseli divaricatum Pursh, Fl. Amer. Sept. 732. 1814. 

 Musenium divaricatum Nutt.; T. & G. Fl. N. A. i: 



642. 1840. 

 Adorium divaricatum Rydberg, Bot. Surv. Neb. 3: 



37- 1894. 



Decumbent or ascending, branched, glabrous, 6'- 

 12' high. Leaves bipinnatifid, petioled, 2 / -6 / long, 

 the rachis narrowly winged, the segments oblong 

 or ovate, acutish, 3-5-dentate; umbels mostly long- 

 peduncled, I'-a^' broad, 8-25-rayed; rays rather 

 stout, 3 // -ia // long; pedicels about i^" long in 

 fruit; flowers yellow; fruit smooth, or very nearly 

 so, about 2" long. 



Prairies, Manitoba and the Upper Missouri region to 

 the Northwest Territory and Oregon. May-June. 



2 



Scapose 



2. Musineon tenuifolium Nutt. 

 Musineon. (Fig. 2674.) 



Musenium tenuifolium Nutt.; T. & G. Fl. N. A. i: 642. 1840. 

 Adorium tenuifolium Kuntze, Rev. Gen. PI. 264. 1891. 



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

 high, pale and somewhat glaucous. Leaves petioled, de- 

 compound into linear acute incised segments; esc apequla- 

 ling or slightly exceeding the leaves; umbel l /z'-\' broad, 

 5-i8-rayed; rays 2 // -5 // long; flowers greenish white (?); 

 pedicels ^ // -2 // long in fruit; fruit oblong, nearly smooth, 

 about i" long and y z " thick, its ribs rather prominent when 

 dry. 



In dry rocky places, Nebraska, and in the Rocky Mountains. 

 June-July. 



