332 CONVOLVULACE-S:. (convolvulus family.) 



9. P. subulfita., L. (Ground or Moss Pink.) Depressed; leaves 

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

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

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

 setioea, L.) Dry rocky hills and sandy banks, S. New York to Michigan and 

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

 handsome in blossom. 



P. Drumii6ndii, 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-lobed ; 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 alpme dwarf evergreen, growing in very dense 

 convex tufts, with the stems Imbricated below mth cartilaginous naiTowly spat- 

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

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

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

 Linnaeus to this plant.) 



1. D. ]^app6nica, L. — Alpine summits of the White Mountains, New 

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



4. PYXIDANTHEBA, Miehx. Pyxidantheea: 



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

 Otherwise 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 nvfis, 

 a small box, and avBjjpa, anther, the anther opening as if by a lid.) 



1. P. 'barbulaita, Michx. — Sandy pine barrens of New Jersey, and 

 southward. April, May. 



Oeder. 81. CONVOLVULACEjE. (Convolvulus Fam.) 



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

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

 sepals ; a 5-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 i-celled; the embryo large, curved or coiled in 

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

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



