PYROLA, RHEUM. 
383 
acute, sub-serrate, white downy : flowers in compound heads, lateral ones 
peduncled : bracts setaceous. 1 — 5 f. S. 
10— 1. PYROLA. 18. 51. 
rotundifo'lia , (shin-leaf, pear-leaf wintcrgreen. O. w. J. 7[.) style declined : 
leaves rounded or broad-oval obsoletely serrulate, sub-coriaceous, shining : 
petiole about as long as the lamina : scape many-flowered. 6 — 12 i. 
cUip'tica , (O. g-w. Ju. 'll.) leaves membranaceous, elliptical-ovate, serrulate 
rather acute, lamina longer than the petiole : scape nearly naked : bracts 
subulate : calyx 5-toothed : style declinate, scape 10 in. 
11— 5. PYRUS. 36. 92. 
corona' ria, (crab apple. O. w-r. M. L.) leaves broad oval, at the base rounded, 
sub-angled or sub-lobcd, serrate, smooth : peduncles corymbcd. Flowers 
sweet scented. S. 
Exotic. 
commu'nis, (pear. E. w-r. M. ij.) leaves ovate, serrate, (rarely entire) : pedun- 
cles corymbed. 
ma'lus , (apple. E. w-r. M. Tj.) flowers in sessile umbels : leaves ovate-oblong, 
acuminate, serrate, glabrous : claws of the petals shorter than the calyx : 
styles glabrous. Var. sylvestris, (wild apple) leaves ovate serrate : fruit 
small, austere. 
cydo'nia, (quince. E. w. J. 1?.) flowers solitary : fruit tomentose : leaves ovate, 
entire. 
Remark. The varieties into which the above species have been extended 
by culture, are very numerous. 
19—2. QUERCUS. 50. 99. 
alba, (white oak. O. M. T 7 .) leaves oblong, sinuate-pinnatifid, pubescent be- 
neath ; lobes obtuse, entire, narrowed at their bases, particularly on full- 
grown trees : fruit peduncled : calyx somewhat bowl-form, tubercled flat- 
tened at the base : acorn ovate. The most useful timber-tree in America. 
70-80 f. S. 
12—13. RANUNCULUS. 26.61. 
Leaves divided. 
aborti’v'us, (O. y. M. 'll-.) glabrous : stem striate, naked below : radical leaves 
heart-reniform, obtusely crenate ; cauline ones petioled, ternate, angled : 
upper ones sessile : branches about three-flowered. 9 — 15 i. iS. 
re'pens, (O. y. M. %.\ pubescent : leaves ternate, 3-cleft, gashed : creeping 
shoots sent off in the summer : peduncles furrowed : calyx spreading. 
Damp. 
a'cris, (crowfoot, butter cup. O. y. M. 'll.) hairs close-pressed : leaves 3-parted, 
many-cleft ; upper ones linear : peduncles terete : calyx spreading. 1 — 2 f. 
14—2. REPHANUS. 39. 63. 
Exotic. 
sati'xus, (garden radish, w. J. Q.) leaves lyrate: silique terete, torose, 2-cell- 
ed. There are several varieties of this species — one has a fusiform, another 
a globose, another a black root. 
9—3. RHEUM. 12. 28. 
Exotic. 
palma'tum, (rhubarb. J. %.) leaves palmate, acuminate. From China. 
rhapon ticum, (pie rhubarb, w. J. %.) leaves heart-ovate, obtuse and acute, 
smooth : veins sub-pilose beneath, the sinus at the base dilated : petioles 
furrowed on the upper side, rounded at the edge. Radical leaves very 
large. 2 — 4 f. 
33 
