350 APIUM, ARETHUSA. 
5—2. APIUM. 45. 60. 
Exotic. 
petroseli'num , (parsley. Ju. J 1 .) cauline leaves linear : involucrum minute. 
grave'oltns , (celery. Ju. stem channelled: cauline leaves wedge-form. 
18—5. APOCYNUM. 30. 47. 
androsccmifo'lium , (dog-bane. O. r-w. J. %.) stem erect and branching; 
leaves ovale : cymes lateral and terminal : tube of the corolla longer 
than the calyx, with a spreading limb. 3 f. S. 
cannab"invm, (O. g-y. J. 7] .) leaves lanceolate, acute, at each end, smooth 
on both sides : cymes paniculate : calyx as long as the tube of the corol. 
12—5. AQUILEGIA. 26. 61. 
canadtn'sis , (wild columbine. O. r. Sz y. Ap. 7|_.) horns straight : stamens 
exsert. leaves decompound. Growing frequently in crevices of rocks. 
15 i. 
Exotic. 
vulga'ris , (garden columbine. J. 2J..) horns incurved: leafy; stem and 
leaves glabrous ; leaves decompound. The nectariferous horns become 
numerous by culture ; one hollow horn within another. 15 i. 
14—2. ARABIS. 39. 63. 
lyra'la , (w. A. cf.) stem and upper leaves smooth and glaucous: radical 
leaves lyrate-pinnatifid, often pilose: stem branched at the base ; pedi- 
cels much longer than the calyx. 10 i. 
canadtn'sis , (O. w. J. 21.) stem leaves sessile, oblong-lanceolate, narrow 
at the base, pubescent : pedicels pubescent, reflexed in the fruit : sili- 
ques pendalous, sub-falcate, nerved. 2 f. S. 
rhombo' idea , (spring cress. O. w. M • 2J..) leaves glabrous, rhomboidal, re- 
pand toothed, the lower ones nearly round, on long petioles ; root tube- 
rous. 15 i. Wet. S. 
5—5. ARALIA. 46. 59. 
raccmo'sa , (spikenard. O. w. J. 2|_.) spreading branches : petioles 3-parted, 
the partitions 3 — 5- leaved; leafets often heart-form ; branchlets axilla- 
ry, leafy : umbels many, sub-panicled, leafless above. Damp. 4 f. 
nudicau'Us , (O. g-w. J. 2j..) stem hardly a caulis: leaf solitary, terquinate : 
scape shorter than the leaf: umbels few. S. 
10—1. ARBUTUS. 18. 51. 
uva-ur"si , (bear-berry, kinnikinnick. O. w-r. M. b>.) stem procumbent: 
leaves wedge-obovate, entire : berry 5-seeded. Dry, barren sand plains, 
&c. Very abundant about the great lakes. 
17— 1. ARCTIUM. 49. 54. 
lappa, (burdock. O. r. An. 21.) cauline leaves heart-form, petioled, tooth- 
ed flowers panicled, globose : calyx smooth. 
10—3. ARENAIIIA. 22. 82. 
1. Leaves oblong. 
laleriflor"a , (sand-wort. O. w. J. 7j.) stem filiform, simple: leaves ovate, 
obtuse, sub-triple-nervcd : peduncles lateral, solitary, elongated, 2-cleft ; 
one pedicel middle-bracted ; corolla longer than the calyx. 6 — 10 i. 
18- 1. ARETHUSA. 7. 21. 
bulbo'sa , (arethusa. O. r. J. 2)..) leafless : root globose; scape sheathed, 
1-flowered ; calyx with the superior divisions incurved ; lip sub-crenu- 
late, Flowers large, sweet-scented. Damp. 
