272 



CONVOLVULACE^E. XIV. IPOMOSA. 



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 Ipomoea. Fl. ? Clt. 1733. Shrub tw. 



* * Peduncles many-flotvered, umbellately-racemose, umbellate, 

 corymbose, fyc. 



80 I. SID&FOLIA (Choisy, 1. 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. ^ ^- 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. Doming6nsis, Desr. 

 in Lam. diet. 3. p. 554. Conv. sidaeiolius, H. B. et Kunth, 

 nov. gen. 3. p. 99. Conv. multiflorus, H. B. et Kunth, 1. c. p. 

 100. Conv. (Ipomce'a) Zeylanica, Moon, ex Wall. cat. no. 

 1379. Conv. laevicaulis, Willd. herb, ex Roem. et Schultes, 

 syst. 4. p. 303. Conv. poliferus, Willd. 1. c. p. 302. Sloane, 

 jam. 1. p. 153. 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 Ipomcea. Shrub tw. 



81 1. STAPHYLINA (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. If. . 

 *"*. S. Native of the East Indies, as of Coromandel, Penang, 

 Pondicherry. Ipomce'a racemosa, Roth. nov. spec. p. 115. but 

 not of Poir. Conv. Malabaricus, Wall. fl. ind. 2. p. 49. but 

 not of Lin. Conv. racemosus, Rottler and other authors ; but 

 not of Spreng. Wilid. in Rcem. et Schultes, syst. 4. p. 30s!. 

 Conv. Kleinii, Spreng. syst. 1. p. 606. 4. p. 61. Conv. maxi- 

 mus, Ham. herb. Conv. polyanthus, Wall. cat. no. 1378. 

 Branchlets rough, blackish. Leaves 3 inches long and 2j broad. 

 Racemes 2-3 inches long, many-flowered. Corolla 6-12 lines 

 long, rose-coloured. Seeds woolly. 



Staphylina Ipomcea. Shrub tw. 



82 I. CALTGINOSA (Choisy, 1. 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. I/ .? *"\ S. 

 Native of the East Indies. Conv. caliginosus, Keen. mss. in 

 R. Br. herb. Stem blackish. Leaves 3 inches long and 1| 



broad. Corolla glabrous, longer than the calyx. Seeds brown, 

 silky. 



Obscure Ipomcea. PI. tw. 



83 I. CYMOSA (Rcem. et Schultes, syst. 4. p. 462. but not of 

 Meyer. Choisy, 1. 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. If,. r> . S. Native of the East Indies, 

 almost everywhere. Conv. cymosus, Desr. in Lam. diet. 3. p. 

 55G. Conv. bifidus, ft. Vahl. symb. 3. p. 31. Conv. laeVis 

 minor, Rumph. atnb. 5. p. 431. t. 158. Conv. blandus, Wall, 

 fl. ind. 2. p. 50. t. 70. Ipomce'a bifida, Roth. nov. spec. p. 

 118; Ip. corymbosa, Roth. 1. c. p. 109. Ip. Heynei, Rcem. et 

 Schultes, syst. 4. p. 237. Ip. blanda, Sweet, hort. brit. p. 288. 

 Conv. Lotuoha, Ham. herb. Conv. multiflorus, 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. ft, pilosa (Choisy, 1. c. p. 462.") plant hairy, or downy. 

 If. . /0> . S. Native of the East Indies, Conv. cymosus, ft. 

 Desr. in Lam. diet. 3. p. 556. Conv. bifidus, Vahl, symb. 3. 

 p. 30. Conv. Rothii, Spreng. syst. 1. p. 600. Conv. lae'vis 

 mas. Rumph. amb. 5. p. 431. Conv. pentagonus, 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. cymosa, 

 Roth. nov. spec. p. 116. Blum. cat. hort. buit. p. 50. Conv. 

 blandus, ft. pubescens, Roxb. Conv. blandus, ft. major, Wall, 

 mss. Seeds hairy. 



Far. y, sagittato-angulata (Choisy, 1. c. p. 463.) leaves sagit- 

 tate, angular. 11 . '"\ S. Native of Java. Ip. radicans, Blum, 

 bijdr. p. 712. ? Leaves form of those of var. ft. 



Far. S, culta (Choisy, 1. c.) stem rather downy ; leaves cor- 

 date-ovate ; peduncles 3-12-flowered ; corolla glabrous; all 

 parts of the plant more elongated. 1. r ^. S. This is a culti- 

 vated variety. 



Cfymose-flowered Ipomcea. Fl. July, Aug. Clt. 1820. 

 PI. tw. 



84 I. VELUTINA (R. Br. 1. c.) tomentose; leaves cordate, ob- 

 tuse, entire, soft, having the recess at the base, rather truncate ; 

 peduncles many -flowered ; sepals glabrous, obtuse. I/ . ? / *\ S. 

 Native of New Holland, within the tropic, on the sea shore. 

 Conv. velutina, Spreng. syst. 1. p. 601. 



Velvety Ipomoea. PI. tw. 



85 I. CONGE'STA (R. Br. 1. c.) tomentose; leaves cordate, 

 acuminated, entire, soft ; peduncles many-flowered : pedicels 

 crowded ; sepals ending in subulate awns : inner ones smaller. 

 It.? / ~ > . S. Native of New Holland, within the tropic, on the 

 sea shore. Conv. congestus, Spreng. syst. 1. p. 601. 



Crorvded-fiowered Ipomcea. PI. tw. 



86 I. URCEOLA'TA (R. Br. 1. c.) tomentose ; leaves cordate, 

 rather reniform, entire ; cymes many-flowered, nearly sessile ; 

 sepals equal, pilose, orbicular, obtuse ; tube of corolla urceolate, 

 subovate. !(.. '~ 1 . S. Native of New Holland, within the tropic. 

 Conv. urceolatus, Spreng. syst. 1. p. 601. 



Urceolate- flowered Ipomoea. PI. tw. 



87 I. DUMETORUM (Willd. rel. ex Rcem. 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. Q. ^\ 

 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 Ipomcea. PI. tw. 



