ARISTOLOCHFA, ASCLEPIAS. 
351 
18—6. ARISTOLOCHIA. 11. 23. 
serpenta'ria , (O. p. J. 2)..) leaves heart-form, oblong, acuminate; stem 
zigzag, ascending; peduncles radical; lips of the corolla lanceolate, 
(the Virginia snake-root.) There is a variety with very long, narrow 
leaves • 
11—1. ARMENIACA. 36. 92. 
Exotic. 
vulga ris , (apricot. Ij.) leaves sub-cordate ; stipules palmate, Var. precox, 
(early apricot.) fruit small, yellow. Var. persicoides , (peach apricot.) 
fruit sub-compressed. 
11—5. ARONIA. 36. 92. 
bolrya’pium , (shad-bush, june-berry. O. w. Ap. T?.) leaves oblong-oval, 
cuspidate, glabrous when mature, (when first expanded lanceolate and 
downy;) flowers racemed ; petals linear; germs pubescent; segments 
of the calyx glabrous. 
17— 2. ARTEMESIA. 49. 55. 
Exotic. 
pon’ tica , (roman artemisia.) leaves downy beneath ; cauline ones bipin- 
nate ; leafets linear ; branches simple ; flowers roundish, peduncled, 
nodding. 
absyntli ium, (wormwood. 2)..) stem branchincr, panicled ; leaves hoary ; 
radical ones triply pinnatifid ; divisions lanceolate, toothed, obtuse ; 
cauline ones 2-pinnatifid or pinnatifid ; divisions lanceolate, acutish ; 
floral ones undivided, lanceolate. Naturalized in the most mountain 
districts of Ncw-England. 
abrotanum , (southern-wood. %. & f£.) stem straight ; lower leaves bipin- 
nate ; upper ones hair form, pinnate ; calyx pubescent, hemispheric. 
19—12. ARUM. 2. 7. 
triphyl"lum, (indian turnip, wild turnip, wake robin. O. p. g. A- w. M. 7J..) 
subcaulescent ; leaves ternate ; leafets ovate, acuminate, spadix club- 
form; spatha ovate, acuminate, peduncled with the lamina as long 
as the spadix. One variety, virens, has a green spatha; another, atro- 
purpureum, has a dark-purple spatha ; auother, album , has a white 
spatha. 1 — 3 f. 
3—2. ARUNDO. 4. 10. 
canadtn 'sis , (E. Au. 2]..) panicle oblong, loose ; glumes scabrous, pubes- 
cent, as long as the corolla; corolla awned on the back; hairs at the 
base equalling the valves : culm and leaves smooth. 3 — 4 f. 
18—12. ASARUM. 11. 23. 
canaden'se , (w-hite snake-root, wild ginger. O. g-p. M. 2J_.) leaves broad- 
rfmiform, in pairs ; calyx woolly, deeply 3-parted ; the segements sub- 
lanceolate, reflexed. S. 
18— 5. ASCLEPIAS, 30. 47. 
1. Leaves opposite. 
syri'aca , (common milkweed. O. w-p. Ju. 2J..) stem very simple; leaves 
lanceolate-oblong, gradually acute, downy beneath; umbels sub-nod- 
ding, downy, 3 to 5 feet high; flowers in large, close clusters, sweet- 
scented — pollinia are fly-traps. 3 — 5 f. S. 
incarna la, (O. r. Ju. 7J..) stem erect, branching above, downy; leaves 
lanceolate, sub-downy both sides; umbels mostly double at their origin; 
the little horn of the nectary exsert. A variety pulchru is more hairy. 
Var. glabra, almost glabrous. Var. alba, has white "dowers. Damp. 
3 f. S. 
