128 
PORTULACCA—PRIMULA. 
I 
PORTULAOt 'A. 12—1. ( Porlulaccea .) [Frofn ^o?Vo, to carry, lac, milk.] 
clera'cea , (purslane, y. J. <§>.) leaves wedge-form ; flowers sessile. 
POTAMOG ETON. 4—4. ( Junci .) [From polamqh, a river, and geiton, adjacent, so called 
because it grows about rivers.] 
natans , (pond-weed, g. J. AL.) leaves long-petioled, floating, lance-oval; at 
first some are Sob-cordate. On water. 
fluitans , (g. Ju. 'll.) lower leaves long, linear, upper qnes lanceolate, nerved, 
coriaceous; all petioled. In water. 
POTENTIAL A. ]1 — 13. (Rosacea,.) [From potentia, powes, so named on account of its sup¬ 
posed power to heal diseases.} 
,r A. Leaves digitate. 
canadcn" sis , (common five-finger, y. M. fif.) procumbent, sub-ramose, whitish- 
silky; stipules ovate, gashed ; leaves wedge-ovate, gash-toothed; stem as¬ 
cending, and creeping, hirsute ; peduncles solitary, elongated ; divisions of 
the calyx lance-linear; petals orbicular, sub-entire, of the length of the 
calyx. 2-18 i. 
argentea , (silver five-finger, w-y: Ju. %.) stem prostrate and ascending, rarely 
sub-erect, branching, white-downy; stipules ovate, acme; leaves wedge- 
form, gash-toothed, silvery white beneath, petals retuse, scarcely longer 
than the calyx. 4-10 i. 
B. " Leaves pinnate. 
anseri'na, (tansey cinquefoil, y. J. 2{i.) creeping ; leaves interruptedly pinnate, 
numerous, gash-serrate, silky, white-downy beneath ; peduncles solitary, 
[-flowered. 
fruticosa , (shrubby cinquefoil, y. J. fij. ) stem fruticose, oblong, lanceolate, en¬ 
tire, approximate; stipules lanceolate, membranous, acute; flowers in co¬ 
rymbs, large; petals longer than the calyx. A shrub 2 feet high, much 
branched, hairy. Margin of swamps. 
C. Leaves ternate. 
tridenta'ta , (mountain cinquefoil, w. Ju. % ) smoothish, stem ascending, di¬ 
chotomous; leaves ternate-palmate; leafets wedge-oblong, coriaceous, 3- 
toothed at the summit, pubescent beneath; stipules lanceolate, acuminate ; 
corymb loose, few-flowered; petals oblong-ovate, longer than the calyx; 
stem 3-6 inches high. Mountains. Frozen regions to Car. 
norwe'gi'ca , (Norway cinquefoil, y. J. 0.) hirsute; stem erect, dichotomous 
above; leaves terna'e, palmate; leafets lance-rhombic, simply and doubly 
serrate; flowers numerous, sub-corymbed, and axillary; petals obcordate, 
shorter than the calyx. 8-10 i. Old fields. Can. to Car. 
POTERIUM. 19—13.. (Rosacea.) [From polerion, a cup ; so called from the shape of the 
flowers.] 
sanguisor'ba, (burnet, J. 2j_0 stem somewhat angled, unarmed; leaves pin¬ 
nate ; leafets serrate ; flowers in heads. Ex. 
PllENANTIIES. 17—1. (Ciclxoracea.) [From prenes, drooping, and anthos, flower.] 
al'ba , (white lettuce, w. p. Au. 2J..) radical leaves angled, hastate, toothed, 
somewhat Jobed; cauline ones round-ovate, toothed, petioled; upper ones 
mostly lanceolate; panicle lax; the terminal fascicle nodding; calyx 8- 
cleft, 8-10-flowered. Var. nana, leaves 3-parted, hastate, ovate, and lan¬ 
ceolate, sometimes all simple ; racemes panicled or simple. 1-3 f. 
altis"sima : (p. y. Au. flj-O stem branching; leaves petioled, 3-lobed, angled, 
denticulate; margin scabrous; racemes axillary; flowers nodding; calyx 
about 5-flowered. 
corda'ta,(w. y. Au. fif-) stem panicled above; leaves petioled, cordate, tooth¬ 
ed, ciliate; floral ones sessile, oblong, entire; panicle lax, raceme-flower¬ 
ed. 4-6 f. 
PRIMULA. 5—1. (Primulacea.) [From primulus, the beginning', so called because it blos¬ 
soms in the beginning of spring. The natural family, Primulaceoe, is a division of Jussieu’s 
order, Lysimachiee.] 
farino'sa , (bird’s-eye primrose, p. %.) leaves obovate-spatulate, mealy beneath; 
umbel many-flowered ; peduncles spreading ; border of the corolla fiat, as 
long as the tube, with obtuse, obcordate segments; scape 6-10 i. Leaves 
all radical. 
