144 UMBELLIFERAE 



1. C. procumbens (L. ) Crantze. l°-2° long, somewhat hairy : ulti- 

 mate leaf segments obtuse : rays 2-5-flowered : fruit somewhat beaked. — 

 Low woods throughout, but not common. April-May. 



2. C. Texensls C. & R. l°-2° high : ultimate leaf segments acutish : 

 rays 10-15-flowered : fruit not beaked. — Barrens north and west of 

 Lee's Summit. Very abundant locally. May- June. This identification 

 is corroborated by Professor Rose. 



12. ■WASHINGTONIA Raf. Sweet Cicely. 

 Involucre and involucels of a few bracts or wanting. Fruit linear, 

 bristly along the ribs, attenuate at the base. Primary and secondary 

 rays of umbel few. 



Villous-pubescent. 1. W. Clnytoni. 



Slightly pubescent or glabrate. 2. W. longistylia. 



1. W. Claytoni (Michx.) Britton. l°-3° high: leaves ternately de- 

 compound : involucre and involucels present : style less than V' long* 

 — In rich woods. Kansas City to Sibley, Lake City and Dodson. Un- 

 common. May-June. 



2. W. longistylia (Torr. ) Britton. Like the last but more glabrate 

 and style \" long. — In rich woods in the northeastern part, but un- 

 common. May-June. 



13. SIUM L. 



Umbels many-rayed. Fruit ovate, glabrous, strongly ribbed. Invo- 

 lucre and involucels prominent. 



1. S. cicutaefolium Gmel. Water Hemlock. 3°-6° high, glabrous : 

 leaves pinnate, the leaflets 3-17, linear-lanceolate, serrate. — Common in 

 swamps near Lake City and Sibley. July-September. 



14. ZIZIA Koch. Meadow Parsley. 



Involucre none. Involucels small. Umbels many-rayed. Fruit ovoid, 



glabrous, somewhat compressed, not winged. 



Basal leaves ternately compound. 1. Z. aurea. 



Basal leaves cordate, not divided. 2. Z. cordata. 



1. Z. aurea (L. ) Koch. l°-3° high : leaves ternately divided, the seg- 

 ments ovate- lanceolate, serrate. — Common throughout in woods and 

 meadows. May-June. 



2. Z. cordata ( Walt. ) DC. Resembles the last, but basal leaves ovate, 

 deeply cordate, crenate : stem leaves ternate or quinate. — Frequent in 

 sandy soil near Grain Valley. May-June. 



15. CICUTA L. 



Involucres usually none. Involucels of numerous bracts. Umbels 

 many-rayed. Fruit ovate to oblong, corky ribbed, glabrous. 



1. C. maculata L. Water Hemlock. 2°-6° high : leaves decom- 

 pound, the leaflets lanceolate and serrate. — Abundant in wet places. 

 June-October. 



