158 UMBELLIFEEJE. 



1. S. Peoten veneeis, Dod. Erect, 1 ft. high more or less leafy 

 throughout, but radical leaves ample, of oblong outline, cut into many 

 short ligulate acuminate lobes: bractlets of involucels many: fr. J£ — 3 in. 

 long including the beak which is the conspicuous part of it, the body 

 and the margins of the beak with tubercles ending in short prickles. — A 

 weed in fields and by waysides. 



23. DAUCUS, Galen. More or less hispid annuals and biennials, 

 with pinnately decompound leaves, involucres and involucels of lobed or 

 divided bracts, and white flowers. Outer rays of umbel longest, in fruit 

 connivent over the inner, giving a concave top to the umbel. Calyx 5- 

 toothed. Fruit ovate or oblong; carpels semiterete or dorsally flattened; 

 primary ribs filiform and bristly, the secondary more prominent, winged 

 with a row of more or less united barbed prickles. Oil-tubes solitary 

 under the secondary ribs. Seeds nearly flat on the face. 



1. D. pnsillus, Michx. Annual, erect, or the branches short and 

 decumbent, % — 2 ft. high, retrorsely hispid; leaves bipinnate, the 

 segments pinnatifid, with short narrowly linear lobes; rays 2—6 lines 

 long, nearly equal; involucre bipinnatifid, equalling the umbel; involu- 

 cels equalling the greenish white flowers: fr. 1% — 2 lines long, short- 

 pedicellate, the prickles usually equalling or exceeding the width of the 

 body: seed slightly concave on the face. — Nearly all parts of the State; 

 on bluffs and hills near the sea, often depressed and condensed.. 



2. D. Oaboxa, L. Biennial, stout, 2—3 ft. high, hispid: involucre of 

 many pinnatifid bracts equalling the large umbel; bractlets scarious, 

 with an herbaceous midrib: fl. white, but the central one of each umbel- 

 let abortive and dark purple : fr. oblong-ovoid, the spines as long as its 

 diameter: fruiting umbel deeply concave, resembling a bird's nest. — The 

 Carrot of the gardens; already becoming a wayside weed. 



24. CAUCALIS, Theophr. Scarcely distinct from Daucus, but fruit 

 more compressed laterally; the seed face deeply-channelled. 



1. C. nodosa, Huds. Branching at base, the long branches reclining, 

 leafy throughout and retrorsely hispid: leaves pinnate, with pinnatifid 

 divisions : umbels small, naked, subsessile opposite the leaves: carpels 

 unequal, the larger one a line long; surface tuberculate and prickly, the 

 prickles barbed or incurved at summit. — Obscure weed, from Europe. 



2. C. microcarpa, Hook. & Am. Erect, slender, 6—15 in. high, 

 nearly glabrous: leaves much dissected, hispidulous: umbels terminal 

 and at the ends of the branches, subtended by two or more foliaceous 

 dissected bracts, 3 — 6 rayed; rays slender, 1—3 in. long; umbellets few- 

 flowered, the pedicels unequal; involucels of short entire bractlets: fr. 

 oblong-ovoid, 2 lines long, armed with uncinate prickles. — Very common. 



