260 AMMIACEAE. 



eels 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 ultimate 

 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; pedi- 

 cels 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 di- 

 vided. 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 acaules- 

 cent; 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 often 3- 

 lobed; umbel 12-16-rayed; rays 5-9 cm. long; pedicels short, 3-10 

 mm. long; fruit oblong, smooth, 8 mm. long; oil-tubes 3-5 in the 

 intervals, 4-6 on the commissural side. ( Velaea arguta C. & R.) 



Frequent in dry open ground in the chaparral belt. 



10. DRUDEOPHYTUM C. & R. 



Caulescent or acaulescent plants with usually ter- 

 nately compound leaves and yellow flowers. Calyx- 

 teeth evident or wanting. Fruit orbicular, flattened lat- 

 erally, glabrous or pubescent. Carpel with 5 slender 

 filiform ribs. Stylopodium none. Carpophore variable, 

 oil-tubes several in the intervals and on the commissural 

 side. Seeds nearly terete, the inner face with a narrow 

 and deep sulcus, which enlarges into a central cavity. 



1. D. parishii C. & R. Glabrous throughout, nearly acaules- 

 cent, 3-4 dm. high; leaves thickish, ternate-pinnatifid, the seg- 



