UMBELLIFER.E. 157 



Carpel with dorsal ribs filiform, the margin winged; wings coherent 

 when young: oil- tubes solitary in the intervals, obclavate, extending 

 from the apex downward to or below the middle of the carpel. 



1. S. lanatum (Michx.) Stem 38 ft. high: leaves ternate, 12 ft. 

 long, the stout petioles and veins hirsute beneath, the base of the petiole 

 much dilated; leaflets 4 10 in. long, rounded and subcordate, the lobes 

 somewhat palmately arranged, acuminate, toothed: rays many, 3 6 in. 

 long : fl. large, white, irregular, the outer petals being larger : f r. broadly 

 obovate, 46 lines long, slightly pubescent. In wet open ground, or in 

 moist thickets. March, May. 



20. MYRRHIS, Morison (SWEET CICELY). Perennials with thick 

 aromatic roots, rather slender stems not tall, ternately-compound mostly 

 radical leaves: involucres and involucels reduced or obsolete. Flowers 

 white. Calyx-teeth obsolete. Fruit linear to linear-oblong, more or less 

 attenuate at base, acute at summit, glabrous or bristly along the ribs. 

 Carpel nearly pentagonal in section, flattened dorsally if at all. Oil- tubes 

 obsolete in mature fruit. Seed-face slightly concave to deeply sulcate. 



1. M. occidentalis (Nutt.), Beuth. & Hook. Stoutish, puberulent or 

 pubescent: leaflets oblong, 1^ 4 in. long, acute, coarsely serrate, rarely 

 incised: umbel 5 12 rayed, naked or with 1 or 2 bracts; rays 1 5 in. 

 long, mostly erect; pedicels 1 3 lines : fr. 7 12 lines long, \y z lines 

 wide, obtuse at base, glabrous, with prominent acute ribs; the mostly 

 conical stylopodium together with the style % 1 line long. Dry woods. 



2. M. iiuda (Torr.), Greene. Slender, 23 ft. high, more or less pil- 

 ose-pubescent: leaves twice ternate; leaflets 1 2 in. long, ovate, acute or 

 obtusish, rather deeply cleft and toothed: umbel long-peduncled, 35- 

 rayed, naked or with small caducous bracts or bractlets; pedicels % 

 % in. long: fr. slender, 37 lines long, with slenderly attenuate base: car- 

 pels acutely ribbed; stylopodium very short. Common in shady woods. 



21. CHJ1BOPHYLLUM, Columna. Bather slender annuals with 

 ternately compound leaves, and small white flowers in almost naked 

 umbels. Calyx-teeth obsolete. Fruit lanceolate, or ovate-oblong and 

 beaked at summit, the beak not as long as the body ; ribs of carpel 

 equal; oil -tubes present. 



1. C. ANTHBISOUS (L .), Lam. Weak and often half reclining; small 

 umbels opposite the leaves, about 3-rayed: fr. about 2 lines long includ- 

 ing the short beak, roughened with short rigid incurved bristles. In 

 sandy soil at Alameda, etc. 



22. SCA1VDIX, Theophr. Annual, with pinnately decompound leaves 

 cut into countless slender segments. Flower and fruit much as in 

 Chserophyllum, except that the beak of the carpel far exceeds the body. 



