218 GAMOPETALOU8 EXOGEN8 



Annual. Stem 2 to 4 feet high. Leaves 3 or 4 inches long, acute at each end, 

 scabrous, the lower ones petiolate, upper ones subsessile. Racemes pedunculate, 

 1 to 2 or 3 inches long, terminating the slender divaricate branches, mostly dichotom- 

 ous ; pedicels about as long as the fruit ; corolla bluish-white ; nutlets convex, 

 densely covered with barbed prickles. 

 Hob. Borders of thickets; fence-rows, &c. : frequent. Fl. July. Fr. Octo. 



Obs. This troublesome weed is well known to the farmers, by 

 reason of its adhesive bur-like fruit entangling and matting the 

 manes of their horses, and the fleeces of their sheep. 



ORDER LXVII. HYDROPHYLLACEAE. 



Herbs; leaves mostly alternate, and lobed, without stipules; flowers regular, 

 pentamerous and pentandrous ; corolla-lobes convolute in the bud ; stigma bifid ; 

 ovary entire, ovoid, mostly hairy, 1-celled, with 2 parietal placentae; capsule globose, 

 2-valved, few-seeded; seeds reticulated or pitted ; embryo minute, in cartilaginous 

 albumen. '' / ' 



317. IIYDROPHYI/MJM, L. 



[Gr. Hydor, water, and Phyllon, a leaf; the application not obvious.] 

 Calyx 5-parted, rarely with a small appendage in each sinus. 

 Corolla campanulate, 5-cleft, the tube with 5 linear grooved ap- 

 pendages inside, opposite the lobes. Stamens exserted; filaments 

 more or less hairy. Ovary with the placentae expanded so as to 

 line the cell, like an interior pod. Capsule spherical, 1- to 4-seeded. 

 Perennials : flowers in cymose clusters. 



1. H. Virginicum, L. Leaves pinnately dissected; lobes 

 oval-lanceolate, deeply serrate, the lowest ones distinct. 

 VIRGINIAN HYDROPHYLLUM. Water-leaf. 



Stem 12 to 18 inches high, often dichotomously branched near the base, nearly 

 naked, with one or two leaves at summit. Leaves irregularly dissected, about 5- 

 lobed, the 2 lower lobes distinct, and somewhat distant ; petioles of the radical and 

 lower leaves 4 to 6 or 8 inches long, those at summit shorter. Flowers in clus- 

 tered corymbs; common peduncles 2 to 5 inches long, axillary, or opposite to the 

 petioles of the upper leaves; calyx-segments hispid-ciliate, the sinuses without 

 appendages; corolla white, with purplish veins. 

 Hob. Moist, shaded grounds: frequent. Fl. May. Fr. June. 



ORDER LXVIII. POLEMONIACEAE. 



Eerbs; leaves alternate, or opposite, without stipules ; powers regular, pentamerous 

 and pentandrous; corolla-lobes convolute in the bud; s^Ze 3-lobed ; capsule 3-celled, 

 3-valved, loculicidal, the valves usually breaking away from the central column; 

 seeds few, or many, with copious albumen. 



A small Order; but comprising some plants which are admired by Florists, 

 such as the Cobaea scandens, Cav. and several species of Phlox, and Gttia. 



318. POMMO^IUM, Tournef. 



[Gr. Polemos, war; an ancient name, of obscure meaning.] 

 Calyx loosely campanulate. Corolla sub-rotate-campanulate. 

 Stamens declined; filaments with the base dilated, ciliate, connivent 

 and valve-like. Capsule roundish-ovoid, several-seeded. Leaves 

 odd-pinnately dissected ; fiowers in terminal corymbose clusters. 



