332 convolvulace^e. (convolvalus familt.) 



9. P. SubuBnta, L. (Ground or Moss Pinr.) Depressed; leaves 

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

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

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

 setacca, L.) Dry rocky hdls and sandy banks, S. New York to Michigan and 

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

 handsome in blossom. 



P. Drummondii, 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 alpine dwarf evergreen, growing in very dense 

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

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

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

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

 Linnasus to this plant.) 



1. I>. Eapponica, L. — Alpine summits of the White Mountains, New 

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



4. PVXIDAKTHJSRA, Michx. Pvxidanthera. 



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

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

 with narrowly oblanccolate 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 nvt-is, 

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



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

 southward. April, May. 



Order 81. CONVOLVULACEiE. (Convolvulus Fam.) 



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

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

 sepals ; a 5-plaited or 5-lobed corolla convolute or hoisted 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-celled ; 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 



