OC” 
bad CONVOLVULACEZ. XIV. Irouaa. 
of a pale yellow brown colour. Jalap, when dear, is often adul- 
terated with scammony, gamboge, briony root, &c. Jalap is an 
active purgative, which can always be relied upon, and would be 
administered much more often were it not for the disagreeable 
effects produced by it, as nausea and griping. It is, notwith- 
standing, a safe medicine, and, combined with other purgatives, 
has been proved by Dr. Hamilton to be of eminent use in 
typhus, scarlatina, cynanche maligna, marasmus, chorea, and 
tetanus. Added to the supertartrate of potass, it is called com- 
pound powder of jalap; and much good has been effected by a 
judicious and persevering use of this preparation in dropsical 
cases. The alcoholic extract, when good, is a more active pre- 
paration than the former, exerting its effects in doses of 10 or 12 
grains. Jalap is best given in substance, in doses from 10 
grains to half a drachm, combined with a drop or two of any 
essential oil. Mr. Hume, of Long-Acre, is said to have disco- 
vered a vegeto-alkaline principle in jalap, and proposes to call it 
jalapine. 
Jalap lpomoea. Fl.? 
Clt. 1733. Shrub tw. 
* * Peduncles many-flowered, umbellately-racemose, umbellate, 
corymbose, $c. 
80 I. sinxróL1A (Choisy, l. c. p. 459.) glabrous; leaves cor- 
date-ovate, or roundish-acuminated, smooth; peduncles many- 
flowered, leafy, umbellately racemose, equalling the petioles in 
length, or exceeding them ; outer sepals shorter, all with white 
scarious edges; corolla whitish-yellow. h.%. S. Native of 
the Caribbee Islands, Mexico, and Ceylon. Also gathered in 
the gardens of Teneriffe, Cumana, and Calcutta; but is pro- 
bably only indigenous to Ceylon. Conv. Domingénsis, Desr. 
in Lam. dict. 3. p. 554. Conv. sidzefolius, H. B. et Kunth, 
nov. gen. 3. p. 99. Conv. multiflórus, H. B. et Kunth, 1. c. p. 
100. Conv. (Ipomee’a) Zeylánica, Moon, ex Wall. cat. no. 
1379. Conv. levicaülis, Willd. herb. ex Roem. et Schultes, 
syst. 4. p. 803. Conv. poliferus, Willd. 1. c. p. 302.— Sloane, 
jam. 1. p. 158. t. 97. f. 2.—Young branches rather downy. 
Leaves rarely rather downy, 2-3 inches long, and 1-2 broad. 
Bracteas small, linear, ciliated, or glabrous. Corolla campa- 
nulate, glabrous, white, with a yellow bottom, and marked 
with 5 black spots. Capsule surrounded by a membrane at the 
base. Seeds downy, rufous. There are varieties of this having 
the flowers more or less numerous, the leaves glabrous or 
downy, and the sepals more or less unequal. 
Sida-leaved Ypomoea. Shrub tw. 
81 I. Srapuyzina (Roem. et Schultes, syst. 4. p. 249.) plant 
suffruticose, glabrous ; leaves ovate-oblong, rather cordate, 
acute, glabrous ; flowers racemosely panicled ; sepals equal, 
very blunt, ovate-roundish ; corolla tubularly cylindrical. 2. 
A.S. Native of the East Indies, as of Coromandel, Penang, 
Pondicherry. Ipomoe'a racemósa, Roth. nov. spec. p. 115. but 
not of Poir. Conv. Malabáricus, Wall. fl. ind. 2. p. 49. but 
not of Lin. Conv. racemósus, Rottler and other authors; but 
not of Spreng. Willd. in Roem. et Schultes, syst. 4. p. 302. 
Conv. Kleínii, Spreng. syst. 1. p. 606. 4. p. 61. Conv. máxi- 
mus, Ham. herb. Conv. polyánthus, Wall. cat. no. 1378. 
Branchlets rough, blackish. Leaves 3 inches long and 21 broad. 
Racemes 2-3 inches long, many-flowered. Corolla 6-12 lines 
long, rose-coloured. Seeds woolly. 
Staphylina Ypomoea. Shrub tw. 
82 I. caLiGINOsA (Choisy, l. c. p. 461.) glabrous; leaves 
ovate-lanceolate, mucronulate, deeply cordate at the base; pedun- 
cles axillary, shorter than the leaves, cymosely corymbose ; 
sepals coriaceous, ovate, obtuse, surrounding the fruit. 2/.? ^. S. 
Native of the East Indies. Conv. caligindsus, Koen. mss. in 
R. Br. herb. Stem blackish. Leaves 3 inches long and 14 
“da 
broad. Corolla glabrous, longer than the calyx. Seeds 
silky. 
Obscure Ipomeea. Pl. tw. 
83 I. cymdsa (Roem. et Schultes, syst. 4. p. 462. but not of 
Meyer. Choisy, l. c. p. 461.) stem terete; leaves ovate-cor- 
date, acute at the apex, also acuminated, elongated, blackish 
above; peduncles axillary, bifidly many-flowered, short ; sepals 
coriaceous, obtuse, rarely acutish, darkish yellow: the exterior 
ones usually the shortest. 2t. ^. S. Native of the East Indies, 
almost everywhere. Conv. cymósus, Desr. in Lam. dict. 3. p. 
556. Conv. bífidus, B. Vahl. symb. 3. p. 31. Conv. levis 
minor, Rumph. amb. 5. p. 431. t. 158. Conv. blándus, Wall. 
fl. ind. 2. p. 50. t. 70. Ipomee'a bifida, Roth. nov. spec. p. 
118. Ip. corymbósa, Roth. 1. c. p. 109. Ip. Hóynei, Roem. et 
Schultes, syst. 4. p. 257. Ip. blánda, Sweet, hort. brit. p. 288. 
Conv. Lotuóha, Ham. herb. Conv. multiflórus, Wall. mss. 
Stem blackish. Leaves 1-3 inches long, and 6-18 lines broad, 
glabrous. Corolla campanulately funnel-shaped, pure white, an 
inch long, glabrous : lobes bearded at top. Seeds rufous, hairy. 
Var. f, pilósa (Choisy, l. c. p. 462.) plant hairy, or downy. 
Y. ^. S. Native of the East Indies. Conv. cymdsus, fj. 
Desr. in Lam. dict. 3. p. 556. Conv. bífidus, Vahl, symb. 3. 
p. 30. Conv. Róthii, Spreng. syst. 1. p. 600. Conv. le'vis 
mas. Rumph. amb. 5. p. 431. Conv. pentagónus, Roxb. fl. ind. 
2. p. 72. Ipomoe'a bifida, Roem. et Schultes, syst. 4. p. 241. 
Ip. Rothii, Roem. et Schultes, syst. 4. p. 237. Ip. cymósa, 
Roth. nov. spec. p. 116. Blum. cat. hort. buit. p. 50. Conv. 
blándus, 9. pubéscens, Roxb. Conv. blándus, 6. major, Wall. 
mss. Seeds hairy. 
Var. y, sagittàto-angulàta (Choisy, 1. c. p. 463.) leaves sagit- 
tate, angular. 2/.^. S. Native of Java. Ip. radicans, Blum. 
bijdr. p. 712.? Leaves form of those of var. p. 
Var. 6, ctilia (Choisy, l. c) stem rather downy ; leaves cor- 
date-ovate; peduncles 3-12-flowered ; corolla glabrous; all 
parts of the plant more elongated. 24. C. S. This is a culti- 
vated variety. 
Cymose-flowered Ipomcea. 
Pl. tw. 
84 I. verutina (R. Br. l. c.) tomentose; leaves cordate, ob- 
tuse, entire, soft, having the recess at the base, rather truncate; 
peduncles many-flowered ; sepals glabrous, obtuse. /.? Bass 
Native of New Holland, within the tropic, on the sea shore. 
Conv. velutina, Spreng. syst. 1. p. 601. 
Velvety Ipomeea. Pl. tw. 
85 I. coxcE'srA (R. Br. l. c.) tomentose; leaves cordate, 
acuminated, entire, soft; peduncles many-flowered : pedicels 
crowded ; sepals ending in subulate awns: inner ones smaller. 
21.2 C. S. Native of New Holland, within the tropic, on the 
sea shore. Conv. congéstus, Spreng. syst. 1. p. 601. 
Cronded-flowered Ipomoea. PI. tw. 
86 I. uncEora' rA (R. Br. l. c.) tomentose; leaves cordate, 
rather reniform, entire ; cymes many-flowered, nearly sessile ; 
sepals equal, pilose, orbicular, obtuse; tube of corolla urceolate, 
subovate. 2t.^. S. Native of New Holland, within the tropic. 
Conv. urceolatus, Spreng. syst. 1. p. 601. 
Urceolate-flowered Ipomoea. PI. tw. 
87 I. pumetérum (Willd. rel. ex Roem. et Schultes, syst. 4. 
p. 789.) glabrous; leaves ovate, much acuminated, cordate, 
having the hind lobes angularly toothed, and diverging; pedun- 
cles axillary, dichotomous, 5-flowered, shorter than the leaves ; 
sepals ovate, acutish, glabrous, wrinkled, nearly equal. ©. 
S. Native of New Granada, on the Andes of Quito. Conv. 
dumetorum, H. B. et Kunth, nov. gen. 3. p. 101. Stem angu- 
larly striated. Pedicels rather rough. Capsule globose, gla- 
brous. 
Bush Ipomoea. Pl. tw. 
Fl. July, Aug. Clt. 1820. 
