ORDER 63. UMBELLIFER^S. 387 



erect. Lvs. finely divided. Umbels pedunculate, few-rayed. Invol. ; 



involucel few-leaved. Fls. minute, white. 



L. divaricatus DC. Umbels (very small) 3 to 5-rayed, lateral and terminal ; in- 

 volucel Ivs. divided, shorter than the very short pedicels ; fr. rnuricated with short, 

 whitish, erect scales. Dry sandy soils, S. Car., Ga. Sts. 2 to 8' high. An insig- 

 nificant weed. Mar., Apr. 



30. DISCOPLEUhRA, DC. BISHOP-WEED. (Gr. dioitog, the disk, 

 irXevpd, a rib ; that is, the disk and ribs (of the fruit) united.) Calyx 

 teeth subulate, persistent ; petals ovate, entire, with a minute, inflexed 

 point; fruit ovate, often didymous ; carpels 5-ribbed, the 3 dorsal ribs 

 filiform, subacute, prominent, the 2 lateral united, with a thick, acces- 

 sory margin ; intervals with single vittae ; seeds subterete. (I) Lvs. ca- 

 pillaceous-dissected. Umbels compound. Bracts of the invol. cleft. 

 Fls. white. 



1 D. capillacea DC. Erect or procumbent; umbels 3 to IQ-rayed; Ifts. of the 

 invol. 3 to 5, mostly 3-ckft; fr. ovate. In swamps near the coast, Mass, to Ga. 

 St. much branched, 1 to 2f high. Lvs. very smooth, ternately dissected, with 

 filiform, spreading segm. Umbels axillary and terminal, pedunculate, spreading. 

 Invol. Ifts. about 3, with setaceous segm. Involucels filiform, longer than the um- 

 bellets. Jn. Sept. (Ammi, Spreng.) 



2 D. costata. Branched, erect; umbels 7 to lo-rayed; bracts of the im-ol. 10 to 

 12, 2 to 5-parted; If. -segm. filiform, numerous, apparently verticillate ; fr. with ribs 

 and vittce strongly contrasted. Swamps, Ogeechee R. to the Miss., more common 

 than Xo. 1, which prevails northward. St. stouter, 1 to 2f high. The corky ribs 

 and persistent sepals conspicuous on tho ovate fruit. Oct., Nov. (Ammi costa- 

 tum Ell.) 



3 D. Nuttallii DC. Erect, tall; umbels 15 to 2Q-rayed; invol. few-bracted, 

 bracts entire ; fr. as broad as long. Wet prairies, Ky. to Fla. and La. Sts. 2 to 

 Gf high, branched above. Lvs. few, but with numerous capillaceous segm. In- 

 vol. not half as long as the rays ; involucela minute. Umbels near 2' broad. 



31. NEUROPHYL'LUM, Torr. & Gray. (Gr. vevpav, a nerve (vein), 

 (/>i;/l/loi>, leaf; leaves prominently veined.) Calyx limb of 5 lanceolate, 

 persistent teeth ; petals obovate, joint inflexed ; stylopodium conical ; 

 fruit laterally compressed, ovate ; ribs filiform, slight ; intervals with 3 

 vittae, commissure with 4 ; seed teretely plano-convex. 11 Tall, slen- 

 der, smooth. Lvs. ternate, segm. very long, linear, entire, 3-veined. 

 Umbels perfect. Invol. to 3-leaved; involucel 4 to C-leaved. Fls. 

 white. (The same as Archemora ternata JSTutt. ?) 



N. longifolmm Torr. & Gr. Swamps, N. Car. to Fla. (Chapman). St. 3 to 4f 

 high, branched above, very slender. Rt. Ivs. 12 to 18' long, the segm. much 

 shorter than the petioles. Umbel 5 to 7 -rayed, rays very slender. Bracts of in- 

 vol. and involucel subulate, very short. Sept. 



32. SrUM, L. WATER PARSNIP. (Celtic siw, water; that is, a 

 genus of aquatic plants.) Calyx margin 5-toothed or obsolete ; petals 

 obcordate, with an inflexed point ; fruit nearly oval ; carpels with 5 

 obtusish ribs, and several vittse in each interval ; carpophore 2-parted. 

 2 Aquatic. Lvs. pinnately divided. Umbels perfect, with partial 

 and general many-leaved involucra. Fls. white. 



1 S. latifolium L. St. angular, sulcate; Ifts. oblong-lanceolate, acutely and 

 coarsely serrate, acute; cal. teeth elongated. A tall plant in swamps and ditches, 

 N. J. ? to Ind. and Can. St. 3 to 4f high, smooth, hollow, with deep-furrowed 

 and prominent angles. Lfls. or segm. 4 to 6' long, 1 to 2' broad, in 3 to 5 pairs, 

 with a sessile odd one, each with about 10 large, sharp teeth. Umbels very 



