Carrot Family. 63 



5 equal ribs: oil tubes solitary in the intervals. Stylopodium conical. 



C. procumbens (L.) Crantz. Stems weak, spreading, smoothish or some- 

 what hairy, 4-1(5 inches high: umbels few-rayed; leaflets trifid or pinnatifid: 

 fruit acute. Low woods: April-May: infrequent; Johnson, Henry, Story, and 

 Decatur counties. 



OSMOKRH'ZA Raf. Glabrous or hirsute perennials, with large aromatic 

 roots, and biternately divided leaves. Involucre and involucels few-leaved. 

 Flowers white. Calyx-teeth obsolete. Fruit long, linear, bristly, attenuate 

 at the base. Stylopodium small, conic. 



O. longistylis DC. Glabrous or somewhat pubescent; stem 1-2 feet high; 

 style nearly as long as the ovary. Rich woods; May-June; common. (Wash- 

 inutonia longistylis (Torr.) Britton.) 



O. brevistylis DC. Villous; stylopodium and style about as long as the 

 width of the ovary. With the preceding. {W. claytoni, (Mx.) Britton.) 



ERYNGIUM L. Perennials, with coriaceous leaves, and bracted sessile 

 flowers in dense heads. Calyx-lobes prominent, rigid, persistent. Petals in- 

 flexed. Fruit ovate or obovate, scaly; ribs obsolete; oil-tubes usually 5. 

 Stylopodium wanting; styles filiform. 



E. yuccae folium Mx. Button Snakeroot. Stem 2-4 feet high, glabrous, 

 striate; leaves often 1-2 feet long, rigid, grass-like, parallel-veined, tapering 

 to a point, remotely bristly; heads ovate-globose; flowers white. Prairies; 

 July-August; common. (E. aquaticum L.) 



SANICULA L. Smooth biennials or perennials, with few palmately divided 

 leaves, and greenish yellow flowers. Umbels irregular, few-rayed. Involucre 

 and involucels few-leaved. Calyx-teeth prominent and persistent. Fruit 

 globular, ribless, with 5 oil-tubes, densely clothed with hooked bristles. 



S. marylandica L. Stem 1-3 feet high, but little branched; leaves 3-7- 

 parted, root-leaves long-petioled; segments irregularly serrate or dentate, 

 often incised; staminate flowers many, long-pedicelled; calyx-segments lan- 

 ceolate, cuspidate; petals and anthers greenish white; pistillate flowers ses- 

 sile; styles slender, recurved, longer than the bristles. Low woods; May- 

 July: common. 



S. gregaria Bicknell. Stems usually clustered, weak, erect, 1-3 feet high; 

 leaves 5-divided; segments doubly serrate, teeth bristle-tipped, incised; calyx 

 lobes ovate, obtuse; petals and anthers yellow: styles longer than the bris- 

 tles. This species probably belongs to our flora. 



S. canadensis L. Biennial, stem 1-4 feet high, branched; leaves 3-5 

 divided; segments cuneate-obovate to oblong, serrate and incised; staminate 

 flowers never in separate heads: styles shorter than the bristles. Low woods; 

 May-August: common. 



PASTINACA L. Biennial, with pinnately compound leaves, involucre and 

 involucels mostly wanting, and yellow flowers. Calyx-teeth obsolete. Fruit 

 flat, oval, the dorsal ribs filiform, the lateral broad and nerved. Stylopodium 

 depressed. 



P. sativa L. Stem 3-4 feet high, grooved, glabrous; root fusiform; leaves 

 downy beneath; leaflets ovate to oblong, toothed, terminal 3-lobed, all more 

 or less lobed or incised. Fields and waste places; July-September; frequent. 



POLYTAENIA DC. Perennial, glabrous herb, with pinnately decompound 

 leaves, upper opposite, lower alternate and long-petioled, involucre wanting, 

 involucels of narrow bractlets, and bright yellow flowers in compound um- 

 bels. Calyx 5-toothed. Fruit flattened, obovate to oval, glabrous, dorsal ribs 

 small, obscure, lateral thick and corky. Stylopodium wanting. 



