Along streams and wet meadows in Okla. (the var. villicaulis) and Tex. in the 

 Blackland Prairies and perhaps in the Timber Belt, N. M. (Colfax Co.), rare; from 

 e. Can., s. to Ala. and Tex., w. to Alta., Colo, and N. M. 



8. Caucalis L. 



A genus of about 5 species, native to Asia, the Mediterranean region and North 

 America and Central America. 



1. Caucalis microcarpa H. & A. 



Slender annual 1-4 dm. tall, simple or branched especially above, more or less 

 spreading-hirsute throughout; leaves chiefly cauline, the blade mostly 2-6 cm. long 

 and 2-5 cm. wide, pinnately dissected into small, narrow ultimate segments; inflo- 

 rescence of compound umbels; involucre of several fairly well-developed, scarcely 

 modified leaves; rays of the umbel 1 to 9, ascending, 1-8 cm. long; involucel of 

 several pinnatifid to entire bractlets; pedicels markedly unequal; flowers white; 

 calyx teeth evident; petals cuneate or obovate, with a slender inflexed tip; styles 

 short, the stylopodium thick and conic; fruit oblong, 3-7 mm. long, beset with 

 uncinate prickles along the ribs, those of alternate ribs larger and tending to be 

 confluent at the base. 



Along streams and on open vernally wet slopes in Ariz. (Coconino, Mohave, 

 Gila, Pima and Santa Cruz cos.) Apr.-June; Ida. to B.C. s. to Ariz, and Baja 

 Calif. 



9. Trepocarpus DC. 



A monotypic genus of the southern United States. 

 1. Trepocarpus Aethusae Nutt. Fig. 580. 



Plant slender, erect, 3-5.5 dm. high, caulescent, simple or branching, glabrous, 

 herbaceous, annual from slender taproots; leaves pinnately decompound, 8-10 cm. 

 long, the short divisions linear and acute; cauline leaves little reduced upward; 

 inflorescence of compound umbels; peduncles to 95 mm. long, lateral and opposite 

 the leaves; involucre of 1 to several foliaceous entire or divided bracts to 15 mm. 

 long; involucel of bractlets (3-8 mm. long) like the bracts; rays 2 to 4, spreading, 

 to 15 mm. long, the 2 to 8 pedicels very short; flowers white, the calyx teeth linear 

 and unequal, the stylopodium conic; carpophore divided to the base; fruit oblong- 

 linear, 8-10 mm. long, slightly compressed laterally, glabrous, the primary ribs 

 obsolete but 4 secondary ribs and the face of the commissure prominently corky; 

 oil tubes small, solitary under the secondary ribs and 2 on the commissure, more 

 or less imbedded in the seed and adhering to it, the seed face plane or slightly 

 concave. 



Chiefly on river bottoms and terraces in wet ditches and ponds, and marsh- 

 meadows, in Okla. (McCurtain and Le Flore cos.) and in Tex. in the Timber Belt 

 and Blackland and Coastal prairies, Apr.-June; from Tex., n. to Ark. and e. 

 to S.C. 



10. Chaerophyllum L. Chervil 



Plants erect or spreading, caulescent, branching, glabrous or pubescent, herba- 

 ceous, annual or biennial from taproots or tubers; leaves ternate-pinnately decom- 

 pound, the ultimate divisions or lobes small; inflorescence of compound umbels, 

 the peduncles terminal and axillary or frequently obsolete; involucre usually lack- 

 ing; involucel of numerous conspicuous bractlets that are longer or shorter than the 

 pedicels and reflexed or spreading in fruit; rays few, spreading-ascending, the 

 pedicels spreading; flowers white (rarely red or yellow), the calyx teeth obsolete, 

 the stylopodium conic; carpophore 2-cleft part-way to the base; fruit linear to 



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