58 Trans. Acad. Set. of St. Louis. 



besides recognizing C. procumhens Shortii and G. Taintu- 

 rieri dasycarpum. Dr. Gray at first recognized only C. 

 procumhens and C. procumhens Shortii. Dr. Chapman rec- 

 ognized C. procumhens and O. Tainturieri, the first being 

 (7. Tainturieri and the last being smooth Tainturieri and Dr. 

 Rose's C. Tainturieri Floridanum. Dr. Britton in the Illus- 

 trated Flora recognized two species and one variety, C . pro- 

 cumhens, C. procumhens Shortii, and C. Tainturieri, the last 

 largely made up of C. Texanum. 



To my mind it is much better to consider these varieties as 

 good species, especially as each exhibits individual characters 

 that are very stable. 



After several years of field observation and herbarium 

 work, it is with no little confidence that I present the fol- 

 lowing : 



ANALYSIS OF SPECIES. 



Leaves coarsely divided. Northern species. 

 Fruit beaked, smooth, ribs narrow. 1. C. procumhens. 



Fruit beakless, pubescent, ribs narrow. 2. C. Shortii. 



Leaves finely divided. Southern species. 

 Fruit beakless, smooth, ribs broad. 3. C. Texanum. 



Fruit beaked, pubescent, ribs broad. 4. C dasycarpum. 



Fruit beaked, smooth. 

 Ribs thicker than the intervals. 5. C Tainturieri. 



Ribs narrower than the intervals. 

 Base of fruit broad, obtuse. 6. C. Floridanum. 



Base of fruit narrow, acute. 7. C. reflexum. 



1. Chaerophyllum procumhens (L.) Crantz, Class. Umb. 

 77. 1767. 



Scandix procumhens L. Sp. PI. 1 : 257. 1753. 



From glabrous to very pubescent; stems weak, spreading 

 or procumbent, or rarely erect, 2-5 dm. high ; umbels sessile 

 or peduncled, few-rayed; rays 1-5 cm. long; fruiting umbels 

 open, of 2 to 4 fruits on weak and usually spreading pedicels 

 4-9 mm. long ; fruit narrowly oblong, about 8 mm. long, 

 glabrous, narrowed and commonly beaked at the apex ; ribs 

 filiform, much narrower than the broad intervals; styles very 

 short; seed face deeply sulcate. Rich, shaded ground along 

 streams, April and May. 



Type locality: "Virginia;" collected by Gronovius, No. 

 147. 



