220 GAMOPETALOUS EXOGENS 



Corolla deep purplish-red, the tube about an inch long, a little curved. 

 Hub. Woodlands; nearPcwZi: very rare. Fl. May. Fr. July. 



Obs. This pretty species is occasionally seen in the gardens of 

 persons of taste. I have not met with it, myself, growing wild. 



* * Corolla-lobes emarginate. 



4. P. divariCiYta, L. Stems ascending, loosely branched from 

 the base; leaves lance-oval or oblong, acute, thinnish; corymb 

 loosely paniculate. 



DIVARICATE PHLOX. 



Stems 9 to 15 inches long, numerous, straggling, some of them nearly procum- 

 bent and runner-like, with erect branches. Leaves 1 to \% inches long, the upper 

 pairs distant, subcordate and clasping at base, those on the runner-like branches 

 nearly acute at base, becoming thick and coriaceous. Corymb di- or tri-chotomously 

 and somewhat divaricately branching; corotta pale lilac, or bluish-purple, the 

 tube % of an inch long, slightly curved. 

 Hob. Damp thickets ; along Schuylkill : rare. FL May. Fr. June. 



5. P. Sllblllata, L. Stems prostrate, with numerous short 

 assurgent branches ; leaves subulate-linear, rigid. 



SUBULATE PHLOX. Mountain Pink. Ground Pink. 



Stems 8 to 12 or 18 inches long, the assurgent branches 2 to 4 inches high. 

 Leaves about half an inch long, cuspidate, crowded, with axillary clusters of 

 smaller ones. Corymbs 3- to 6-flowered; corolla pink-purple, with a dark purple 

 centre, the tube about % an inch long, a little curved ; sometimes the flowers are 

 white. 

 Hob. Rocky hills; Serpentine ridges : abundant. Fl. April. Fr. July. 



Obs. This species is chiefly confined to the Serpentine rock, with 

 ns ; and when it is in full bloom, the hills, at a distance, appear as 

 if covered with a sheet of flame. 



ORDER LXIX. CONVOLVULA^CEAE. 



Mostly trailing or twining herbs, often with a milky juice; leaves alternate (rarely 

 none!), entire or lobed, without stipules ; flowers regular, often large; calyx of 5 

 Imbricated persistent sepals ; corotta 5-plaited, or 4- or 5-lobed, twisted or convolute 

 in the bud ; stamens mostly 5 ; capsule 1- or 2- to 4-celled, often septifragal, few- 

 seeded; seeds with a little mucilaginous albumen; cotyledons sometimes (i. e. in the 

 leafless plants) wanting! 



An interesting and rather anomalous Family of plants ; comprising some valu- 

 able, some nuisances, a number beautiful, and several which are singularly 

 curious in their structure and habit. 



SUBORDER I. CONVOLVULE V AE. 



Green and leafy plants ; cotyledons large and foliaceous, crumpled or corrugated ; 

 eoroUa large, plicate, obscurely lobed. 



320. CAL.YSTE\GIA, R. Br. 



[Gr. Kalos, beautiful, and Siege, a covering ; in allusion to the bracts. 

 Calyx covered by 2 large opposite subcordate bracts. Corolla 

 campanulate. Stamens included. Stigmas 2, oblong. Ovary im- 

 perfectly 2-celled. Capsule 1-celled, 4-seeded. Perennials: leave* 

 entire, sagittate-cordate at base ; flowers solitary, on long axillary 

 peduncles. 



