G3G UMBELLIFERjE. Caucalis. 



^I"- 2. D. pusillus (Michx.) : stem (especially the lower part) retrorsely muri- 

 cate-hispid ; leaves blpinnately divided ; the segments pinnatifid, with nar- 

 row linear lobes; leaflets of the involucre bipinnatifid, nearly as long as the 

 (small) umbel; prickles equalling tlie breadth of the ovate fruit, distinctly 

 barbed at the summit.— Mic/m / fl. 1. p. 164 ; Pursh, fl. 1. p. 19-2 ; Ell. 

 sk. I. p. 349 ,- DC. ]3roclr. 4. p. 213. 



p. microphyllus : lower part of the stem and petioles villous with retrorse 

 or spreading rather soft hairs. — D. microphyllus, " Presl, in herb. Hanke ;" 

 DC. prodrTi.p. 213 ; Hook. fl. Bor.-Am. \. p. 271. 



y. scaber : stem hirsute with short retrorse hairs, scabrous-aculeolate above. 

 — D. scaber, Nutt. ! mss. 



Fields and prairies, South Carolina ! to Louisiana and the Southern part 

 of Arkansas. /?. Plains of the Oregon, Dr. Scouler! Douglas! Nuttalll 

 Nootka Sound, Htenke. y. California, Nuttall ! May.—® or (2) Stem 1-2 

 feet high, scabrous (as are also the petioles and rachis) with sharp elevated 

 papillae at the base of the hairs. Rays of the umbel about an inch long. 

 Flowers ochroleucous. Fruit about half as large as in D. Carota ; the 

 prickles confluent and a little dilated at the base, minutely scabrous. Vittae 

 large aud filled with a pungent oil. 



Series 2. Seed with the margins involute, or deeply furrowed on the 

 face. (Subord. Campylospeum^, DC.) 



Tribe X, CAUCALINE^. Koch; DC. 



Fruit laterally contracted or somewhat terete. Carpels with 5 

 primary bristly or prickly ribs, of which the lateral ones are on the 

 commissure : secondary ribs 4, more prominent and prickly, or 

 sometimes obliterated by the copious prickles filling the entire 

 intervals. Seed involute, or with the margin inflexed. — Umbels 

 compound. 



39. CAUCALIS. Linn. ; Hoffm. Umb. p. 54. t. 1, /. 14 ; DCinodr. I. c. 



CalyTc-teeth ovate-lanceolate. Petals obovate, emarginate, with an in- 

 flexed point; the exterior ones deeply 2-cleft and larger. Carpels with 5 

 primary filiform bristly or prickly ribs, and 4 more prominent secondary ones, 

 divided into a single row of prickles. Intervals with single vittae under the 

 secondary ridges. Commissure with 2 vittae. Carpophore rigid, 2-cleft at 

 the summit. Seed involute or the margin inflexed. — Annual herbs with 

 many-cleft leaves. Involucre none, or 1-2-leaved. Involucel of 3-8 

 lanceolate spreading leaflets. Flowers white ; the central ones staminate, 

 sterile. DC. 



§. Petals oval, incurved, but scarcely emarginate at the apex: involucral 

 leaves 3-i-4, bipinnatifid (or the umbel sessile, leafy at the base?). — Cau- 

 CALIUM, Nutt. 



1. C. microearpa (Hook. & Am.) : sparsely-pubescent; leaves blpinnate- 

 ly divided ; the segments pinnatifid, with linear lobes ; leaves of the invo^ 

 lucre resembling those of the stem; umbel of 3-5 somewhat elongated rays^ 



