ASCLEPIADEZE. XLI. Ascrertas. 
narrowed, very acute, glabrous, roughish above, on the edges. 
. H. Native of Georgia, on the river Athamaha. Flowers 
purple. Allied to 4. amo?na. 
Laurel-leaved Swallow-wort. Fl. July. Pl. 2 feet. 
21 A. ciNE'REA (Walt. fl. carol. p. 105. Gmel. syst. 5. p. 446.) 
stems erect, simple, with an alternating downy line; leaves 
nearly linear, smooth, with revolute edges; umbels lateral, few- 
flowered ; horns of corona inclosed. 2/. H. Native of Caro- 
lina. Enslénia cinérea, Spreng. syst. 1. p. 850. Flowers white. 
This species is placed between 4. acuminàta, and A. paupér- 
cula, by Walt., but is not mentioned by Pursh. 
Grey Swallow-wort. Fl. July, Aug. Clt. 1825. Pl. 1 foot. 
22 A. rupricau'Lis (H. B. et Kunth, nov. gen. amer. 3. p. 
148.) stems erect, simple, reddish, downy at top ; leaves nearly 
sessile, erect, linear, with revolute edges, nerved, glabrous. %. 
F. Native of Mexico, on the declivities of mountains, near La 
Vente del Perigrino. Umbels many-flowered. Flowers white, 
a little larger than those of 4. galioides; segments of corolla 
oblong-elliptic, flat, sub-emarginate. Appendages of corona ex- 
serted. The revolute edges of the leaves of this species, and the 
two following, are perhaps occasioned by drying, and are, there- 
fore, probably flat in the recent state. 
Red-stemmed Swallow-wort. Fl. April. Pl. 3 to 1 foot. 
23 A. mósrA (H. B. et Kunth, nov. gen. amer. 3. p. 189.) 
stems erect, almost simple, downy at top ; leaves erectish, 
linear, 1-nerved, with revolute edges, puberulous above, and 
clothed with hoary down beneath; umbels 15-flowered. 2/.G. 
Native of Mexico, near the town of Chilpancinga. Flowers 
structure and size of those of Æ. rubricaális, but rose-coloured ; 
and the appendages of the corona rather shorter. 
Rose-coloured-flowered Swallow-wort. Fl. June, Aug. Clt. 
1824. Pl. 4 to 1 foot. 
24 A. LINIFÒLIA (Hort. madr. ex H. B. et Kunth, l. c. p. 190.) 
stem suffruticose?, branches having a downy line on one side 
only ; leaves on very short petioles, spreading, linear or lanceo- 
late, acute, with rather revolute edges, veiny, membranous, gla- 
brous; umbels about 10-flowered; peduncles downy on one 
side; appendages of corona hardly exserted. %4. G. Native 
of Mexico, between the city and Chapollepeque. A. sali- 
cifolia, Lodd. bot. cab. 272. Flowers white, size of those of £. 
nívea. 
Flax-leaved Swallow-wort. FI. Clt. 
Shrub 2 to 3 feet. 
25 A.crAucEscENs (H. B. et Kunth, l. c. p. 190.) stems 
erect, simple, glabrous; leaves on very short petioles, linear- 
oblong, acute, somewhat cordate, flat, veiny, thickish, glabrous ; 
glaucescent beneath ; umbels interpetiolar and terminal. 2/. G. 
Native of New Spain, betwixt Acapulco and La Vente de la 
Moxonera. Leaves 33 inches long. Interpetiolar umbels soli- 
tary, and the. terminal ones twin? Flowers size of those of A. 
Syriaca, sweet-scented. Pedicels and peduncles downy. Co- 
rollas white; appendages of the corona sublunate, compressed, 
a little exserted. Follicles hairy or downy in the immature state. 
Glaucescent-leaved Swallow-wort. Pl. 1 to 2 feet. 
* * Leaves verticillate. 
July, Aug. 1818. 
26 A. QUADRIFÒLIA (Pursh, fl. amer. sept. 1. p. 183.) stems 
erect, simple, glabrous; leaves ovate, acuminated, petiolate ; 
those in the middle of the stem larger, and 4 in a whorl, the rest 
opposite; umbels twin, terminal, loose-flowered ; pedicels fili- 
form. %.H. Native from New York to Virginia, on lime- 
stone rocks. Jacq. obs. 2. p. 33. Lodd. bot. cab. 1258. 
Flowers small, sweet-scented, with white petals, and red nec- 
taries. 
Four-leaved Swallow-wort. 
1 foot. 
Fl May, July. Clt. 1820. Pl. 
141 
27 A. vrERTICILLA TA (Lin. spec. 315.) stems erect, often 
branched, having a downy line on one side; leaves very narrow, 
linear, thick, quite glabrous, usually verticillate, but sometimes 
scattered ; appendages of corona exserted. 2t. H. Native from 
New Jersey to Carolina ; and on the upper part of the Arkansas. 
Michx. fl. bor. 1. p. 116. Pursh, 1. p. 183. Lodd: bot. cab. 
1067.—Pluk. mant. t. 336. f. 4. — Corollas with yellowish 
green petals and white nectaries. 
Verticillate-leaved Swallow-wort. 
Pl. 1 to 2 feet. ? 
28 A. Mexica‘na (Cav. icon. 1. p. 42. t. 58.) stems erect ; 
leaves linear-lanceolate, with revolute edges ; lower ones 4-6 in 
a whorl: upper ones 3 in a whorl, or opposite; umbels many- 
flowered. %. G. Native of Mexico.  Follicles furrowed. 
Involucrum of many short leaves. Corollas white, size of those 
of A. nivea. It differs from A. verticillàta, in the leaves being 
much broader, and in the flowers being larger. 
Mexican Swallow-wort. Fl. July, Aug. Clt. 1821. 
to 3 feet. 
29 A. carnroiprs (H. B. et Kunth, nov. gen. amer. 3. p. 148.) 
stem shrubby, branched, furnished with 4 rows of hairs; leaves 
4 in a whorl, almost sessile, erect, linear, with revolute edges, 1- 
nerved, glabrous; appendages of corona awl-formed, and ex- 
serted. h.G. Native of New Spain, in temperate parts, be- 
tween Valladolid de Mechoacan, and Lake Cuiseo. Leaves 24 
inches long. Flowers size of those of A. nivea, white. Follicles 
solitary from abortion. Umbels about 10-flowered. 
Galium-like Swallow-wort. Fl. July, Sept. Shrub. 
Fl. July, Aug. Clt. 1759. 
pr 
* * * Leaves alternate or scattered. a 
30 A. rniNA'RIA (Cav. icon. 1. p. 42. t. 57.) stem shrubby? 
branched? ; leaves scattered, approximate, sessile, linear, fili- 
form, acutely mucronate, with revolute edges, smooth, H. B. 
et Kunth, nov. gen. amer. 3. p. 192; ** leaves linear, subulate, 
channelled ; umbels pedunculate, drooping, lateral many- 
flowered,” Cav.l. c. h.G. Native of Mexico, at Chalco, and 
elsewhere. Flowers white. Appendages of corona clavate, ex 
Cav. ; small, horn-formed, ex Kunth ; corona yellowish. Branches 
downy, ex Kunth. Kunth’s character of this plant does not 
exactly agree with that of Cavanilles. 
Linaria-leaved Swallow-wort. Fl. July. Clt. 1802. Pl. 2 ft. 
31 A. AnMA'rA (Spreng. syst. 1. p. 849.) stem suffruticose, 
beset with retrograde prickles ; leaves ovate-oblong, glabrous ; 
peduncles cymose, lateral; horns exserted. 5. S. Native of 
New Granada, Bertero. 
Armed-stemmed Swallow-wort. Shrub erect. 
32 A. tanucinosa (H. B. et Kunth, nov. gen. amer. 3. p. 
193.) stem simple ? ; leaves alternate, petiolate, ovate-lanceolate, 
rounded at the base, woolly on both surfaces, white beneath ; um- 
bels extra-axillary and terminal, sometimes proliferous; appen- 
dages of corona inclosed. 2t. G. Native of Mexico, between 
Cassava and Pachuca. Herb fetid. Peduncles woolly. Plant 
downy at top. Flowers about the size of those of 4. Curassá- 
vica, white ; segments emarginate. 
Woolly Swallow-wort. Pl. 1 to 2 feet. 
33 A. RU`BRA (Lin. spec. 316.) leaves alternate, ovate, acu- 
minated ; umbels compound; stem erect, simple. 2t. H. Na- 
tive of Virginia. Gron. virg. 27. Flowers red. 
Red-flowered Swallow-wort. Fl. July, Aug. Clt. 1825. 
Pl. 1 to 2 feet. 
34 A. TuBEROsa (Lin. spec. 316.) stems erectish, divaricately 
branched at top, very hairy; leaves scattered, oblong-lanceolate, 
hairy ; umbels disposed in a terminal, sub-corymb. Y. H. 
Native of North America, in stony, sandy fields, and woods, 
common. Pursh, l. p. 184. Ker. bot. reg. 76. Lodd. bot. 
