PENTANDRIA. DIGTNIA. 1*9 



central, sessile; involucell multipartite. Styles filiform, 

 simple. Leaves digitate. (Character taken from 5". mar/- 

 landica; in S.Emopcea, the central Howers are masculine.) 



Species. 1. <S'. marylamUca. 2. canadensis. Both spe- 

 cies g'ro^v in the vicinity of Philadelphia. 



Of this genus there are but 2 other species at present 

 enumerated by Persoon; viz. S.ewopceaj and S. crith- 

 mifoUa, of Russia. 



259. DAUCUS. i. (Carrot.) 



Fruit oblong, partly solid, ribs ciliated with 

 Iiispid hairs or barbed bristles. Involucrum i>in- 

 iialifid. 



Umbell many-rayed, while in flower flat, in fruit partly 

 contracted into the form of a funnel. Petals coidately in- 

 flected; 5 primary ridges of the seed scarcely prominent, 

 nearly smooth; 4 secondary muricate. 



Species. 1. -D. carota. Commonly naturalized. 2. 

 pusilhis. Probably only a variety of D. carota. 



The genus Daucus, now containing 15 or 16 species, ex- 

 ists exclusively in Barbary and the south of Europe, ex- 

 cepting I), copticus of Egypt. 



260. AMMI. L, (Bisliop's-weed.) 



Flowers radiated, all hermaphrodite. Petals 

 cordattly inflected. << Fruit oblong, corticate, 

 angular, ridges 5, obtuse, intervals convex." 

 SpRENGEL.f Involucrum pinnatifid. 



Somewhat allied to Daxicin in habit; umbell loose, sub- 

 divaricate. 



Spectes. 1. ^.? eapillacenm. Q) About 1 foot high. 

 Leaves almost capdiary divided, smooth, bipinnatifid, pin- 

 nule: trifid or unequally bifid; peduncle of tlie umbell 4 

 to 8 .nclies long, angularly groo\-ed. Umbell spreading, 

 imequal, 4, 6, or 8-rayed. Involucrum about oleavod, 

 leaves simple or trifid. Umbellet about 4, 6, or 8-fiov>er- 

 ed, central peduncles as v.ell as pedicells being the shor- 

 test. Involucell consisting mostly of one trifid leaf. Calix 

 minute, 5-toothed. Petals oval, entire, with the points in- 

 flected, white. Style very minute, with the base elevated. 

 Fruit partly globose and solid, somewhat ovate, or pointed 

 above, smooth. Seed roundish-ovate, raerabranaceously 



j Plantarum umbelliferarum denuo disponendarum Prodro- 

 mus, auctore Curtio Sprengel, Sic. IBIS- 



