PORTTTLACCA— POTENTILLA. 
453 
pygma'&i, (Ap. 1?.) leaves Iong--linear, divisions of the calyx lance-linear; petals 
wedge-form, obtuse, coriaceous, w^ith the 
t)ranches glabrous; outer petals obovate- 
f>blong, much larger than the calyx. 6-18 i. 
grandijlo'ra, (y-w. Ap. Ip .) leaves wedge- 
obovate, obtuse, under surface and branches 
rufous-pubescent; outer petals obovate, 
much larger than the calyx. 18-24 i. S. 
PORTULAC'CA. 12—1. (Portulaccea.) [From 
porto, to carry, lac, milk.] 
oleta'cea. (purslane, y. J. 0.) leaves 
wedge-form ; flow^ers sessile. 
pilo'^a, (0.) leaves subulate, alternate ; 
axils pilose ; flowers sessile, terminal. S. 
POTAMOGE'TON. 4—4. Uunci.) [From 
potamos, a river, and geiton, adjacent, so 
called because it grows about rivers ] 
nalans, (pond-weed, g. J. 2/.) leaves 
iong-petioled, floating, lance-oval; at first 
some are sub cordate. On water. 
Jluiftans, (g. Ju. IJ[.) lower leaves long, 'calyx; corolla large, pal 
linear, upper ones lanceolate, nerved, cori- 
aceous ; all petioled. In v^^ater. 
JieteropkyVlum, (variegated pond-w^eed, 
g. Ju. 24!.) upper leaves floating, coriaceous, 
elliptical, petiolate, lower ones membranous, 
linear-lanceolate, sessile. 
diversifolium, (g. Ju. 11.) upper leaves 
floating, elliptical, petiolate, 5-nerved, lower 
ones filiform ; spike axillary, almost sessile, 
few-flowered. Water. 
'pp.r folia' turn, (g. Ju, Z/.) leaves amplexi- 
caui, cordate, ovate ; spike few-flowei'ed, 
orbicular, sub-entire, of the length of the 
calyx. 2-18 i. 
argen"tea, (silver five-finger, w-y. Ju. IS.) 
stem prostrate and ascending, rarely sub- 
erect, branching, white-downy; stipulep 
ovate, acute ; leaves wedge-form, gash- 
toothed, silvery white beneath; petals re 
tuse, scarcely longer than the calyx. 4-10 i 
sim"plex, (y. Ap. 11.) erect, simple, hir- 
sute; leaves oblong-oval, coarsely toothed; 
peduncles axillary, solitary, long, 1-flow- 
ered ; petals nearly round, obcordate, 
longer than the calyx. 
sarmento'sa, (y. M. 11.) stem sarmentose , 
leafets obovate, obtuse, serrate, glabrous 
above, hirsute beneath ; petals roundish, 
longer than the calyx. 
rec"ta, (y, J. If.) erect; leaves in fives 
and sevens ; leafets lanceolate, coarselj' 
toothed ; petals obcordate, larger than the 
B. Leaves pinnate, 
anscn'na, (tansey cinquefoil. y. J. IX ' 
creeping; leaves interruptedly pinnate 
numerous, gash-serrate, silky, white-down^ 
beneath ; peduncles solitary, 1-flowered. 
fruticn'sa, (shrubby cinquefoil, y. J. 11.] 
stem fruticose, oblong, lanceolate, entire, 
approximate ; stipules lanceolate, membra- 
nous, acute ; flowers in corymbs, large ; 
petals longer than the calyx. A shrub 2 
feet high, much branched, hairy. Margin 
on a short peduncle W atcr. | of swamps. 
lu'ceTift, (g. Au. 11.) leaves ovate-lanceo- pennxylva'nica. (y. Ju. 2/.) erect, vei-j 
late, petiolate, pellucid, and finely veined ; I soft, somewhat whitish-vilIo.se; leafets ob- 
Bpikc long, cylindrical. Jong, obtuse, sub-pinnatifid, woolly ; panicle 
c'ris"j)um, (r-g. J. 24-) leaves lanceolate, straight, many-flowered; segments of the 
tapering, sessile, undulate, serrate ; spike 
0-i.O flowered. Lakes. 
peclina'him, (g. J. 2^.) leaves .setaceous, 
distichus, alternate, sheathing ; spikes ter- 
minal, interrupted. 
gramin"eum, (grass poiid-weed, g. Ju. 
11.) leaves linear, grass-like, alternate, ses- 
sile ; stipules broad; stem terete, sub-di- 
chotomous. In July, some of these plants 
begin to rai.se their spikes of unopened 
flower-buds to the surface of the water; as 
eoon as the stigmas are fertilized by the 
pollen, the spikes are again withdrawn, to 
ripen the fruit under water; others succeed 
them, and the process continues. 
cortipres" sum, (g. Ju. 11) leaves linear, 
obtuse, sessile ; stem compressed ; spike 
«i-6 flowered. 
rosterifo'lium, (g-y. Au. 2^.) leaves alter- 
nate, linear, closely sessile ; stem flexuous, 
compressed, sub-alate ; branches axillary; 
stipules lance-linear, acute ; spikes many 
liiO-40) flowered. 2-3 f. 
POTENTIL"LA. 11—12 
calyx semi oval. 
swpi'na, (y. J. @.) stem decumbent, di- 
chotomous ; leafets oblong, incisely serrate ; 
peduncles axillary, solitary, 1-flowered. 
argu'la, (w. J. 2X.) stem erect, pubes- 
cent, viscous above ; leaves unequally pin- 
nate ; leafets somewhat round-ovate, ob- 
lique at the ba.se, doubly gash-toothed ; sti- 
pules sub entire ; calyx acute, somewhat 
shorter than the corolla. 1-3 f. 
Immifu'sa, (y. M.) leaves digitate, qui 
nate ; leafets wedge-oblong, obtuse, gash- 
toothed, white-tomentose beneath ; peduu 
cles short, filiform, procumbent. 4-5 i. )S 
russeUia na, ( ^.) the most beautiful spe 
cies produces rich, dark, scarlet flowers. 
A low shrubby plant. Ex. 
formo'sa, deep red or purple flowers 
blossoming from May to August. Ex. 
C. Leaves teniate. 
tridenia'ta, (mountain cinquefoil, w. Ju 
11-) smoothish ; stem ascending, dichotc 
leaves 
mous ; leaves ternate-palmate ; leafets 
(Rosacea:.) [From wedge-oblong, coriaceous, 3-ioothed at the 
poJeniia, power, so named on account of its ; s„m,„it, pubescent beneath; stipules lance- 
supposed power to Ilea diseases.] w i-i c n 
^„ J- V ^ I olate, acuminate ; corymb loose, few-flow- 
ered; petals oblong ovate, longer than the 
calyx ; stem 3-6 inches high. Mountains. 
Erozeu regions to Car. 
norwe'gi'ca, (Norway cinquefoil, y. J.'l^.) 
hirsute ; stem erect, dichotomous above ; 
leaves ternale, palmate ; leafets lauco 
A. Leaves digitate. 
c,anaden"sis, (common five-finger, y. M. 
iX-) procumbent, sub-ramose, whitish-silky; 
stipules ovate, gashed ; leaves wedge ovale, 
gash toothed ; stem ascending and creep- 
iug, hirsute ; peduncles solitary, elongated ; 
