340 CONVOLVULACE^E. (CONVOLVULUS FAMILY.; 



3. POLEMONIUM, L 



Calyx bell-shaped, 5-cleft. Corolla short-bell-shaped, 5-lobed. Stamens 5, 

 declined, inserted equally on the throat of the 'corolla, with a hairy appendage 

 at the base of the filaments. Ovules numerous in the cells. Capsule ovoid. 

 Seeds angled. Herbs, with alternate pinnately divided leaves, and bine or 

 white flowers in a nearly bractless corymb. 



1. P. reptans, L. Smooth ; stem weak, diffusely branched ; leaves peti- 

 oled, pinnate, with 5-13 lanceolate or elliptical entire leaflets ; corymbs pedun- 

 rled, few-flowered ; flowers nodding ; calyx-lobes ovate, acute ; corolla blue ; 

 anthers white. Shady mountain woods, South Carolina, and northward. April 

 and May. TJ. Stem - 1 high. Leaflets ' - 1' long. Calyx enlarged in 

 fruit. 



4. PYXIDANTHERA, Michx. 



Calyx 3-bracted, 5-sepalous. Corolla bell-shaped, 5-lobed ; the lobes rounded, 

 imbricated in the bud. Stamens broad, adnate to the tube of the corolla : anther- 

 cells roundish, awned at the base, opening by a transverse line. Ovules 5-8 

 in each cell. Capsule few-seeded. A small creeping shrub, with ascending 

 very leafy branphes. Leaves evergreen, linear, bearded at the base, the upper 

 ones alternate. Flowers solitary, terminal. Sepals oblong, obtuse, ciliate. 

 Corolla small, white. 



1. P. barbulata, Michx. (Diapensia, Ell.) Dry pine barrens, North 

 Carolina, and northward. April and May. Stems 3' - 6' long. Leaves 2" - 

 3" long. 



ORDER 99. CONVOL.VTJL.ACE.aE. (CONVOLVULUS 

 FAMILY.) 



Chiefly twining or prostrate herbs, with alternate exstipulate leaves, 

 and regular mostly showy and fugaceous flowers. Calyx 5-sepalous, im- 

 bricated. Corolla bell-shaped, funnel-shaped, or salver-form, 5-plaited or 

 5-lobed, convolute in the bud. Stamens 5, inserted on the tube of the 

 corolla : anthers 2-celled, sagittate. Ovary free, single or double, 1-4- 

 celled, with 1-2 erect anatropous ovules in each cell. Styles 1 or 2, 

 entire or 2-cleft. Stigmas capitate, ovate, or acute. Capsule 2-6-seeded. 

 Embryo large, coiled or curved in mucilaginous albumen. 



Synopsis. 



TRIBE I. CONVOY VTJLEJE. Ovary single. Embryo with leafy cotyledons. Cap- 

 sule opening by valves. Flowers axillary, single or cymose. 

 * Style single. Stigmas globose. 



1. QUAMOCLIT. Capsule 4-celled, 4-seeded. Corolla (red) salver-shaped. Stamens ex- 



serted. 



2. BATATAS. Capsule 4-celled, 4-seed.ed. Corolla bell-shaped. Stamens included. 



