332 COXVOLVULACE^E. (CONVOLVALUS FAMILY.) 



9. P. &nblilfit:i, L. (GROUND or Moss PINK.) Depressed; leaves 

 awl-shaped, lanceolate, or narrowly linear (4'-^' long); cymes few-flowered; 

 calyx-teeth awl-shaped, rigid ; corolla pink-purple or rose-color with a darker 

 centre (sometimes white), the lobes wedge-shaped, notched, rarely entire. (P. 

 sctacca, L.) Dry rocky hills and sandy banks, S. New Ygrk to Michigan and 

 southward. April, May. Commonly cultivated ; the broad matted tufts very 

 handsome in blossom. 



P. DRUM3i6NDii, Hook., a showy annual from Texas, is now common in 

 gardens. 



3. DIAPENSIA, L. DIAPENSIA. 



Calyx of 5 concave imbricated sepals. Corolla bell-shaped, 5-lobcd ; the lobes 

 rounded. Filaments broad and flat, adherent to the corolla up to the sinuses, 

 short: anthers adnate, of 2 ovoid pointless cells, diverging below, 'each opening 

 therefore by a transverse-descending line. Pod enclosed in the calyx, cartilagi- 

 nous; the cells few-seeded. An alpine dwarf evergreen, growing in very dense 

 convex tufts, with the stems imbricated below with cartilaginous narrowly spat- 

 nlate mostly opposite leaves, terminated by a nearly naked scape-like 1 -flow- 

 ered peduncle, 3-bracted under the calyx. Corolla white (y wide). (The an- 

 cient Greek name of the Sanicle, of obscure meaning, strangely applied by 

 Linnseus to this plant.) 



1. D. L*lp]>6liicsi, L. Alpine summits of the White Mountains, New 

 Hampshire, and Adirondack Mountains, N. New York. July. (Eu.) 



4. PYXIDANTIfERA, Michx. PYXIDAXTIIERA. 



Anther-cells awn-pointed at the base, opening by a strictly transverse line. 

 Othenvise much as in Diapensia. A small prostrate and creeping evergreen, 

 with narrowly oblanceolate and awl-pointed crowded leaves, which are mostly 

 alternate on the sterile branches, and somewhat hairy near the base. Flowers 

 solitary and sessile, very numerous, white or rose-color. (Name from niseis, 

 a small box, and avQj}pa, anther, the anther opening as if by a lid.) 



1. P. barblllnta, Michx. Sandy pine barrens of New Jersey, and 

 southward. April, May. 



ORDER 81. CONVOLVULACE^E. (CONVOLVULUS FAM.) 



Chiefly twining or trailing herbs, often with some milky juice, with alternate 

 leaves (or scales) and regular b-androus flowers ; a calyx of 5 imbricated 

 sepals ; a b-plaited or 5-lobed corolla convolute or twisted in the bud ; a 2- 

 celled (rarely 3-celled) ovary, or in one tribe 2 separate pistils, with a pair of 

 erect ovules in each cell, the cells sometimes doubled by a false partition be- 

 tween the seeds, so becoming 4^-cellcd ; the embryo large, curved or coiled in 

 mucilaginous albumen. Fruit a globular 2 - 6-seeded pod. Flowers most- 

 ly showy : pedicels articulated, often 2-bracted. (Many are cultivated for 



