I 
. 88 I A 
oblor - S- Native of Java, in the province of Tjangor, on the 
Paraug mountains, among bushes. Said to be allied to J. tubu- 
lòsa. Corolla with a white limb and green rays. 
Prickly Ipomeea. FI. July. Pl. tw. 
68 I. wELANOsTÍCTA ; downy ; leaves roundish-ovate, deeply 
cordate, with an acutish recess, and very blunt lobes, which are 
acutish or mucronate at the apex, downy, and dotted with black 
beneath ; peduncles 1-flowered, shorter than the petioles ; sepals 
nearly equal, suborbicular, obtuse, mutic. 4.? ^. S. Native 
of the Island of St. Thomas. Conv. melanostíctus, Schlecht, in 
Linnea. 6. p. 737. Corolla large, with a funnel-shaped limb 
and ciliated margins. 
Black-dotted-leaved Ipomoea. PI. tw. 
69 I. rv'24; leaves petiolate, broad-ovate, acuminated, deeply 
cordate: hind lobes obtuse; peduncles bractless, 1-flowered ; 
sepals nearly equal, obtuse, mucronulate; corolla large, with a 
long cylindrical tube, and a funnel-shaped limb. h.?%. S. 
Native of the Island of St. Thomas. Conv. tüba, Schlecht, in 
Linnea. 6. p. 735. Stigmas orbicular. Seeds villous. 
Tube-flowered Ipomoea. PI. tw. 
70 I. zurE'ozA (R. Br. l. c.) glabrous; leaves cordate, acu- 
minated, quite entire, hardly an inch long; peduncles usually 
1-flowered ; sepals acute ; corolla yellow. %.? ^. S. Native 
of New Holland, within the tropic, on the sea shore. I. Brownii, 
Roem. et Schultes, syst. 4. p. 252. 
Fellomish-tlowered Ipomoea. Pl. tw. 
71 I. AsRv'rrA (R. Br. l. c. p. 485.) glabrous; leaves cor- 
date, acutish, having the recess at the base closed ; peduncles 
1-flowered, hardly equalling the petioles in length ; sepals equal, 
oval, obtuse. 2/.? ^. S. Native of New Holland, within the 
tropic. Conv. abrüptus, Spreng. syst. 1. p. 596. 
Abrupt-leaved Ipomoea. Pl. tw. 
72 I. Sısírica (Jacq. coll. 3. p. 304.) smooth; stem trian- 
gular; leaves cordate, acuminated; peduncles 1-2-flowered, 
shorter than the leaves; calyx bractless, ovate. (2. ^. H. 
Native of Siberia. Pers. ench. 1. p. 183. Conv. Sibíricus, 
Lin. mant. p. 203. Conv. rupéstris, Pall. itin. 3. p. 723. t. k.? 
Leaves hardly repand. Stipulas small, running down the stem. 
Corolla white, or very pale red, with a yellow bottom, campanu- 
late, one-half smaller than those of Conv. arvénsis. 
Siberian Ipomoea. FI. July, Aug. Clt. 1779. PI. tw. 
78 I. Cunassa'vica (Roem. et Schultes, syst. 4. p. 237.) gla- 
brous ; stems angular ; leaves roundish-cordate, thickish, nerved 
and pale beneath, rather repand; peduncles 1-flowered, thick- 
ened, bractless, shorter than the lower leaves, and longer than 
the superior ones ; calyx subtubercled ; sepals ovate, adpressed. 
4t. ^C. S. Native of Curassoa. Corolla white, verging to a 
cream-colour, smaller than those of Conv. arvénsis. Capsule 
glabrous. 
Curassoa Ypomeea. Pl. tw. 
74 I. arara (R. Br. prod. p. 484.) glabrous; leaves cor- 
date, acuminated, entire; petioles margined ; peduncles tetrago- 
nal, 1-flowered, winged on the angles; bracteas caducous. 2/.? 
^.S$. Native of New Holland, within the tropic, on the sea 
shore. Conv. alàtus, Spreng. syst. 1. p. 596. 
Winged-peduncled Ipomoea. PI. tw. 
+ + Leaves hastately and sagittately cordate or hastate, or 
sagittate. 
75 Y. era’citis (R. Br. 1. e.) glabrous; leaves hastate, bi- 
glandular beneath at the base, acute at both ends ; peduncles 1- 
flowered; sepals wrinkled, acute, 3 times shorter than the co- 
rolla; seeds bearded at the umbilicus. | 21.? ^. S. Native of 
New Holland, within the tropic, on the sea shore. Conv. gra- 
E cilis, Spreng. syst. 1. p. 604.—-There are varieties of this 
^ 
| CONVOLVULACEÆ. XIV. Irouca. 
273 
plant with pilose stems, and having the hind lobes of leaves 
bluntish. 
Slender Ipomoea. Pl. tw. 
76 I. prepe'sa (R. Br. l. c.) downy ; leaves hastately cordate, 
acuminated, entire: hind lobes rounded; peduncles 1-flowered, 
shorter than the petioles, bibracteate near the base; sepals 
equal, acuminated, pilose; capsule glabrous; seeds woolly. 
3.?^.8. Native of New Holland, within the tropic. Conv. 
plebéius, Spreng. syst. 1. p. 604. 
Plebeian Ipomoea. PI. tw. 
77 I. saciTT FOLIA (Ker. bot. reg. 437.) glabrous; leaves 
oblong-sagittate, the hind recess very deep, and the hind lobes 
somewhat acuminated ; peduncles 1-flowered ; sepals roundish- 
oval; corolla campanulately funnel-shaped. 2/.^. H. Native 
from Virginia to Carolina, in wet situations, among bushes. 
Convólvulus sagittzfólius, Michx. fl. bor. amer. l. p. 138. 
Pursh. fl. 1. p. 144. Conv. speciósus, Walt. fl. car. p. 93. 
Conv. formósus, Gmel. syst. 1. p. 343.— Catesb. car. 1, t. 35. 
Flowers large, of a beautiful rose-colour. 
Arrom-leaved Ipomoea, Fl. June, Sept. 
twining. 
78 I.srrósA (Blum. bijdr. p. 714.) leaves cordate, or sub- 
hastately cordate, acuminated, entire, downy above, and rather 
villous beneath ; peduncles 1-2-flowered, equal in length to the 
petioles; sepals linear-lanceolate, acuminated, setigerous ; stem 
covered with retrograde hairs. 24. C. S. Native of Java, among 
bushes on the mountains. Flowers purplish. Perhaps a species 
of Pharbitis. 
Bristly Ipomoea. Fl. Year. Pl. tw. 
79 I. Ja‘tava (Schiede et Deppe, mss.) glabrous; stems 
angular; leaves membranous, perfectly glabrous, and even on 
both surfaces, cordate-sagittate, acuminated : hind lobes rounded, 
obtuse, quite entire; peduncles 2-flowered, longer than the pe- 
tioles ; sepals lanceolate, obtuse, rather unequal; tube of corolla 
long, narrow, twice as long as the limb, which is nearly entire 
and spreading. 4. ^. S. Native of Mexico, in the woods 
of Chiconquiaco, from whence it is brought to Vera Cruz 
by the inhabitants of Jalapa. The plant is called Purga 
and Laschachne in Mexico. Convélvulus Jálapa, Houst. mss. 
in Miller, dict. ed. 8. no. 31. Lin. mant. 1. p. 43, but not 
of others. Ipomoea Pürga, Wenderoth. Ipomoe'a Schiédeana, 
Zucc. Stems purplish. Leaves often purplish beneath. Co- 
rolla long, tubular; tube ventricose above, constricted a 
little at the throat; with a flat limb, and exserted genitals. 
Anthers oblong, emarginate at both ends. The leaves are said 
to be variable in shape by Miller, who reared some plants from 
seeds sent by Houston, in 1733, in the Apothecaries’ Garden at 
Chelsea. The peduncles generally bear 2 flowers, one of the 
flowers always much earlier than the other. Houston and 
Miller seem to be the only authors who knew the plant which 
produces the true Jalap of the shops; as the plant generally 
described, cultivated, and known as such, is a very distinct spe- 
cies, and appears to be only a purple-Howered variety of Zpomce'a 
macrorhiza of Michx. This plant is found principally in the 
neighbourhood of Jalapa or Xalapa, hence the name. It abounds 
also on the eastern slope of the Cordillera of Anahuac ; and 
in the same latitude is procured the Vanilla and Sarsaparilla. 
From 200,000 to 300,000 Ibs. are annually exported from Vera 
Cruz. Although the root forms a well-known and valuable 
cathartic, which is perhaps more generally employed than any 
other of vegetable origin, it was not until lately that the genus to 
which it belongs was accurately ascertained. In its wild state, 
the plant delights in a dry sandy soil. The dried root of jalap is 
imported in thin, transverse slices, and in round masses ; it is 
solid, hard, and heavy, of a dark grey colour. It has a sickly 
smell, and a sweetish, subacid, nauseous taste. Powdered it is 
1 
Clt. 1819. Plant 
