Carrot Family 283 



rays from 2.5 cm. long to wanting; pedicels 12 mm. long or want- 

 ing; fruit with narrow commissure, cordate in outline, 1 mm. 

 long. 



Common in sandy soil in the foothills and valleys. 



8. CONIUM L. POISON HEMLOCK. 



Tall biennial glabrous herbs with spotted stems, pin- 

 nately decompound leaves, and small white flowers in 

 compound many-rayed umbels. Involucre and involu- 

 cels of ovate acuminate bracts. Calyx-teeth obsolete. 

 Fruit broadly ovate, glabrous, somewhat flattened later- 

 ally. Carpels strongly many-ribbed. Large oil-tubes 

 none, but with a layer of oil-secreting tissue next the 

 deeply concave seed. 



1. C. maculatum L. Erect, much branched, 6-15 dm. high; 

 lower and basal leaves petioled, the upper sessile or nearly so, all 

 pinnately dissected, the leaflets ovate in outline, thin, the ulti- 

 mate segments dentate or incised ; petioles dilated and sheathing 

 at the base; umbels 2.5-7.5 cm. broad; rays slender, 2.5-4 cm. 

 long; pedicels filiform, 4-6 mm. long in fruit; fruit 3 mm. long, 

 its ribs very prominent when dry. 



Occasional in waste places, especially in damp ground. 



9. DEWEYA T. & G. 



Caulescent plants with simply pinnate leaves, mostly 

 no involucre, involucels of few linear bractlets, and 

 yellow flowers. Calyx-teeth prominent. Fruit oblong, 

 flattened laterally, glabrous. Carpel with 5 prominent 

 very acute ribs. Stylopodium none. Carpophore divided. 

 Oil-tubes several in the intervals and on the commissural 

 side. Seeds nearly terete, the face deeply sulcate. 



1. D. arguta T. & G. Glabrous, 3-7.5 dm. high, rarely acau- 

 lescent ; leaves simply pinnate; petioles of the lowest pair, of 

 leaflets sometimes prominent, giving a divaricate appearance; 

 leaflets 5-7, ovate, 2.5-7.5 cm. long, the lowest often subcordate, 

 finely and sharply mucronate-serrate, the terminal and the lowest 



