282 Umbelliferae 



bristly primary ribs and 4 prominent winged secondary 

 ones, with barbed or hooked bristles. Stylopodium thick, 

 conic. Oil-tube's solitary in the intervals under the 

 secondary ribs, 2 on the commissural side. Seed-face 

 deeply sulcate. 



1. C. microcarpa H. & A. Erect slender, 1-3 dm. high, more 

 or less hispid ; leaves much dissected, the segments small; um- 

 bels at the ends of the stem and branches, very unequally 3-6- 

 rayed ; involucre of foliaceous divided bracts ; involucels of entire 

 or somewhat divided bractlets ; rays slender, 7.5 cm. long or less ; 

 pedicels very unequal; fruit oblong, 4-6 mm. long, armed with 

 rows of hooked prickles; the primary lateral ribs near margin of 

 commissural face. 



Frequent in sandy or stony places in the valleys and mountains below the 

 pine belt. 



2. C. nodosa Hudson. Stems erect with few branches, re- 

 trorsely scabrous; leaves pinnate; leatlets bipinnately dissected; 

 umbels scattered along the stems opposite the leaves on very 

 short peduncles, simple or with supplementary short proliferous 

 umbel; fruit 1-4 mm. long, the outside of the umbel with the 

 exterior carpel densely covered with hooked bristles, the inner 

 carpel as well as the inner fruits smooth or with tubercles. 



Oak Knoll, near Pasadena, McClatchu . 



7. APIASTRUM Nutt. 



Very slender smooth branching animals, with finely 

 dissected leaves having filiform or linear segments, and 

 small white flowers in naked unequally few-rayed 

 umbels. Calyx-teeth obsolete. Fruit ovate or cordate, 

 with obscure or obsolete ribs, more or less tuberculate. 

 Carpel with thin pericarp. Stylopodium minute, de- 

 pressed ; styles short. Oil-tubes solitary in the inter- 

 vals and beneath the ribs, 2 on the commissural side. 

 Seed-face narrowly concave or sulcate. 



1. A. angustifolium Nutt. Slender, 0.5-3 dm. high, usually 

 much branched ; leaves 2.5-5 cm. long, biternately or triternaielv 

 divided, with linear or nearly filiform segments; umbels sessile; 



