POTERIUM, PUNICA. 403 



wedge-form, gash toothed, silvery white down beneath ; petals retuse, 

 scarcely longer than the calyx. 4 10 i. S. 



Leaves more or less pinnate. 



anseri'na (tansey cinquefoil. O. y. J. 4), creeping ; leaves interruptedly pin- 

 nate, numerous, gash serrate, silky, white downy beneath ; peduncles soli- 

 tary, 1 flowered- 



1913. POTERIUM. 54. 92. 



Exotic. 



sanguisor"ba (burnet. J. 4), stem somewhat angled, unarmed ; leaves pinnate ; 

 leafets serrate ; flowers in heads. 



171. PRENANTHES. 49. 53. 



al"ba (white lettuce. O. w. p. Au. 4), radical leaves angled, hastate, toothed, 

 somewhat lobed ; cauline ones round ovate, toothed, petioled ; upper ones 

 most lanceolate ; panicle lax ; the terminal fascicle nodding ; calyx 8 cleft, 

 9 or 10 flowered. Var. nana, Bw. low ; leaves 3 parted, hastate, ovate and 

 lanceolate, sometimes all simple ; racemes panicled or simple. 1 3 f. S. 

 51. PRIMULA. 21. 34. 



Exotic. 

 aca'uLis (primrose. 4), leaves rugose, toothed, hirsute beneath ; scape 1 



flowered. 



auric"tda (auricula primrose. 4), leaves serrate, fleshy, obovate ; scape many 

 flowered ; calyx mealy. 



141. PRUNELLA. 42. 39. 



vulga'ris, var.pennsylvanica (heal-all, self-heal. O.,J. 4), leaves petioled, oblong 

 ovate, toothed at the base; lips of the calyx unequal 5 upper one truncate, 

 awned ; stem ascending. 6 12. i. S. 



121. PRUNUS. 36. 92. 



Flowers in racemes. 



virginia'na (wild cherry, rum cherry, cabinet cherry. O. w. M. > ), racemes 

 erect, elongated ; leaves oval oblong, acuminate, unequally serrate, glabrous 

 both sides; petioles generally bearing 4 glands. In open fields the limbs 

 of this tree spread out into an elegant oval top ; but in dense forests it grows 

 to a very great height, with a few contracted branches. $. 

 scroli'na (choke-berry. O. w. J. > ), flowers in lax racemes ; leaves oval short 

 acuminate, opake, doubly and acutely serrate ; midrib bearded on each side 

 towards the base ; petiole with 2 glands. This and the* preceding species 

 have been confounded by many botanists. S. 



canaden"sis (O. w. ^ ), flowers in racemes ; leaves glandless, broad lanceolate, 

 rugose, sharply serrate, pubescent both sides, tapering into the petiole. S. 



Exotic. 

 spino'sa (english sloe. > ), peduncles solitary ; leaves lance oval, pubescent 



beneath ; fruit straight ; branches thorny. 

 cer"asus (garden cherry, w. r. ^ ), umbel sub-peduncled ; leaves lance ovate, 



glabrous, conduplicate. 



domes"tica (plumb, w. M. ^), peduncles sub-solitary; leaves lance ovate, con- 

 volute ; branches thornless. Var. Juliana (damson plum), fruit oblong, blue. 

 Var. daudiana (sweet plum, horse plum), fruit round, at first green, becoming 

 yellowish. Var. enucleata (stoneless plum) the putamen obsolete. 



211. PTERIS. 55. 5. 



aquili'na (common brake. O. Ju. 4), frond pinnate, 3 parted ; barren branches 

 'doubly pinnate, with leafets lance linear, obtuse pinnatifid, toothed ; fertile 

 branches pinnate, with leafets pinnatifid ; divisions acutish, all ciliate. -S. 



101. PTEROSPORA. 18. 51. 



androm"eda (albany beech-drops. E. r-y. Ju. ), scape purple, very tall, bearing 

 a many flowered raceme ; flowers lateral and terminal, nodding ; peduncles 

 filiform, longer than the flowers ; lanceolate scales below, none above. 1 2 f. 

 111. PUNICA. 36 92. 



Exotic, 

 grana'tum (pomegranate. > ), leaves lanceolate ; stem woody. 



