COMARUM. ROSACEtE. 211 



11. COMARUM. Linn. gen. p. 257 ; Endl. gen. 6362. . MARSH ClNq,UEFOlL. 



[Comaros was a name given by the Greeks to a plant supposed to be the modem Arbutus.] 



Calyx deeply 5-cleft, colored inside, with 5 alternate much smaller exterior segments or 

 bracteoles. Petals 5, ovate-lanceolate, acuminate. Achenia aggregated on a large fleshy 

 and spongy persistent hairy receptacle. Styles lateral. Seed attached near the insertion 

 of the style, pendulous : radicle superior. — A perennial herb, creeping at the base. Leaves 

 pinnate. Petals, stamens and styles dark-purple. 



1. CoMARUM PALUSTRE, Litin. Common Marsh Cinquefoil. 



Engl. hot. t. 172 ; Michx. fl. I. p. 302 ; Pursh, fl. \. p. 156 ; Bigel. fl. Bost. p. 203 ; 

 T(«rr. 4- Gr.fl. N. Am. 1. p. 447. Potentilla palustris, Scopoli,fl. Cam. (ed. 2.) l.p. 359, 

 ex Lehm. Potent, p. 52 ; Torr.fl. 1. p. 498 ; Hook. fl. Bor.-Am. 1. p. 187. P. Comarum, 

 Nest. Pot. p. 36 ; DC. prodr. 2. p. 583. 



Stem 1-2 feet high, nearly simple, smoothish below, pubescent with short appressed hairs 

 above. Leaves petiolate : leaflets 5-7, approximate, lanceolate-oblong, rather obtuse, acutely 

 serrate, whitish underneath, green and smooth above. Stipules ovate ; the upper ones partly 

 free, the lower ones wholly adnate to the petiole. Flowers somewhat corymbose at the summit 

 of the stem. Segments of the calyx ovate, acuminate, nearly twice as long as the lanceolate 

 bracteoles. Petals scarcely half the length of the calyx. Receptacle, when mature, large 

 and spongy, somewhat resembling a strawberry, covered by the calyx. 



Sphagnous swamps, northern and western counties ; common. June - July. 



12. FRAGARIA. Tourn. ; Linn. gen. p. 255 ; Endl. gen. 3361. strawberry. 



[ Named from the Latin, fragrans, odorous ; on account of its fragrant fruit.] 



Calyx and corolla as in Potentilla. Achenia scattered on the large pulpy or succulent 

 receptacle. Styles lateral. Seed inserted next the base of the style, ascending : radicle 

 superior. — Perennial stoloniferous herbs, with trifoliolate leaves ; the leaflets coarsely 

 serrated. Scapes cymosely several-flowered. Petals white. Receptacle red, edible when 

 ripe. 



1. Fragaria Virginiana, Ehrh. Wild Straioherry. 



Fruit roundish-ovoid, the achenia imbedded in the deeply pitted receptacle ; calyx spreading 

 in fruit ; peduncles commonly shorter than the leaves. — Willd. sp. 2. p. 1091 ; Pursh, fl. 1. 

 p. 397 ; Torr.fl. 1. p. 590 (in part) ; Bigel. fl. Bost. p. 202 ? ; DC. prodr. 2, p. 570 ; Hooh. 

 fl. Bor.-Am. 1. p. 184 ; Darlingt. fl. Cest. p. 304? ; Torr. ^ Gr. fl. N. Am. 1. p. 447. 

 F. Canadensis, Michx. fl. 1. p. 299. 



27* 



