264 



CONVOLVULACE^E. XI. CALONYCTION. XII. EXOGONIUM. 



Conv. muricatus, Ham. herb. Stem hardly prickly. Peduncles 

 clavate, 2-4-flowered. Flowers very large, pure white, the 

 border being from 4-6 inches in diameter, delightfully but 

 faintly fragrant, opening at sun-set and drooping at day-light ; 

 tube very long, cylindrical. 



Roxburgh's Calonyction. Fl. July, Oct. Clt. 1799. 



3 C. MURICA'TUM ; sepals equal, long, acuminated ; leaves cor- 

 date, acuminated, entire. 0. /> . S. Native of Persia and the 

 East Indies. Ipomoe'a muricata, Jacq. schcenbr. 3. p. 40. t. 323. 

 Roxb. fl. ind. 2. p. 89. Convolvulus muricatus, Lin. mant. p. 

 44. Willd. enum. 1. p. 204. Ipomce'a turbinata, Lagasc. gen. 

 et spec. nov. diagn. p. 10. no. 139. C. speciosum, var. /3. mu- 

 ricatum, Choisy, 1. c.) I. bona-nox. /3. purpurascens, Ker. 

 bot. rep. 290. Stem and peduncles muricated from prickles. 

 Flowers large, pale bluish-purple ; lobes mucronate, tube 

 widening a little towards the mouth, hairy inside, ex Roxb. 

 Peduncles 2-6-flowered. 



Muricated Calonyction. Fl. July, Oct. Clt. 1777. PI. tw. 



4 C. PSUUDOMURICA'TUM (Bernh. hort. elfort, ex Link. enum. 

 1. p. 200. under Ipomce^a) stem muricated; leaves cordate, 

 acuminated, glabrous, 7-nerved ; peduncles shorter than the pe- 

 tioles ; sepals acuminated. Fj . r> . S. Native country unknown. 

 Corolla purple. Very like C. muricalum, but smaller, and the 

 leaves are 7-nerved instead of 9-nerved. 



False-muricated Calonyction. Fl. July, Oct. Clt. 1820. 

 Shrub tw. 



5 C. A'SPERUM (Choisy, 1. c. p. 442.) sepals unequal, short- 

 acuminated. $ . / "\ S. Native of Silhet. Convolvulus asper, 

 Wall. cat. no. 1388. Stem beset with reiroflexed, spiny tubercles, 

 particularly on the older branches. Leaves cordate, acuminated ; 

 hind lobes sometimes roundish-obtuse, and sometimes angularly 

 toothed. Peduncles 1 -flowered. Sepals adpressed to the base 

 of the calyx. Corolla tubularly funnel-shaped, 3-6 inches long. 

 Capsule glabrous, size of a cherry. Seeds angular, downy, 

 especially on the angles. 



.Rough-stemmed Calonyction. PI. tw. 



6 C. TRICHOSPE'RMUM (Choisy, 1. c.) sepals unequal, obtuse. 

 I/.? / "\ S. Native oi Java. Ipomce'a trichosperma, Blum, 

 bijdr. p. 710. Stem quite glabrous. Leaves hastately 3-5- 

 lobed ; middle lobe elliptic-oblong, attenuated at both ends, 

 very acute at apex ; lateral ones acute at apex, and cuneated at 

 the base, as also bifid, quite glabrous. Peduncles 1 -flowered. 

 Sepals ovate ; inner ones rarely mucronate at apex. Corolla 

 tubular, much longer than the calyx, white. ? 



Hairy-seeded Calonyction. PI. tw. 



7 C. GRANDiFLoauM (Choisy, 1. c.) sepals equal, acute. 

 I/ . ^. S. Native of the West Indies. Convolvulus grandiflo- 

 rus, Lin. suppl. p. 136. Desr. in Lam. diet. 3. p. 543. And. 

 bot. rep. t. 403. Convolvulus latiflorus, Desr. in Lam. diet. 

 3. p. 561. Ipomce'a latiflora, Rcem. et Schultes, syst. 4. p. 240. 

 Plum. cat. 1. mss. vol. 2. p. 52. Tourn. p. 83. Leaves 

 large, glabrous, cordate, acuminated. Corolla snow-white, 

 with a long, cylindrical, greenish tube ; limb 5 inches in dia- 

 meter, expanding at night, and fading at day-light. According 

 to Rcem. et Schultes, 1. c. the 2 outer sepals are longer, and 

 acute, and the 3 inner obtuse. 



Great-flowered Calonyction. Fl. Aug. Oct. Clt. ? PI. tw. 



8 C. PTE'RIPES ; glabrous ; peduncles winged, 2-flowered ; 

 pedicels clavate, divaricate ; sepals large, elliptic-oblong, ob- 

 tuse. $ . ? *"\ S. Native of Huayaquil. Leaves cordate, 

 acuminated : auricles rounded. Peduncles longer than the 

 leaves. Corolla downy, (v. s. in herb. Ruiz, et Pav,) 



Winged-peduncled Calonyction. PI. tw. 



9 C. CLAVA'TUM ; sepals wide, mucronate, nearly equal, mem- 

 branous ; stem and petioles pilose; leaves glabrous. $ . ? '"'. 

 S. Native of Huayaquil. Convolvulus clavatus, Ruiz, et Pav. 



mss. in herb. Lamb. Leaves cordate, glaucous beneath, acumi- 

 nated : auricles rounded. Corolla blue, like those of a species 

 of Datura, with narrow segments. 



Clavate Calonyction. PI. tw. 



10 C. JACQUI NII ; sepals unequal, obtuse; leaves cordate, 

 acute. ^ . r ^. S. Native of Martinico, on the banks of rivers. 

 Convolvulus grandiflorus, Jacq. vind. 3. p. 39. t. 69. Plant 

 glabrous. Leaves large, cordate. Peduncles axillary, 1 -flow- 

 ered. Corolla pure white ; tube widening to the top. Seeds 

 brown, rather woolly. 



Jacquin's Calonyction. Shrub tw. 



Cult. The species of Calonyction are among the largest 

 flowering convolvulaceous plants. A light rich soil is the best for 

 them, or a mixture of loam, peat, and sand. They should be 

 reared on a hot-bed, and when of sufficient size they should be 

 planted in separate pots, and shifted from size to size as they 

 grow. They succeed best when trained up trellis-work, or 

 rafters in stoves. 



XII. EXOGO'NIUM (from tfo, exo, outwardly ; and ywvia, 

 gonia, an angle ; in reference to the exserted stamens.) Choisy 

 in mem. soc. phys. gen. 6. p. 443. but not of Mocino and 

 Sesse, Convolvulus and Ipomrc'a species of authors. 



LIN. SYST. Pentdndria, Monogynia. Calyx of 5 sepals. 

 Corolla middle-sized, tubular. Stamens exserted. Style one ; 

 stigma capitate, 2-lobed. Ovarium 2- celled ; cells 2-ovulate. 

 Climbing plants, natives of America. 



1 E. BRACTEA'TUM (Choisy, 1. c.) glabrous ; leaves cordate ; 

 racemes elongated, many-flowered ; flowers bracteate ; bracteas 

 large, cordately reniform, coloured. fj . *"\ S. Native of New 

 Spain, near La Venta de Acaguisotla, at the altitude of 504 

 hexapods. Ipomce'a bracteata, Cav. icon. 5. p. 51. t. 477. 

 Ipomo2 x a spicata, H. B. et Kunth, nov. gen. 3. p. 112. Conv. 

 obovallatus, Spreng. syst. 1. p. 595. Ipomcc v a cincta, Willd. 

 Branches angular, white, glabrous. Flowers pedicellate, distinct, 

 reflexed. Corollas tubularly funnel-shaped, glabrous, yellowish 

 outside and purplish-red inside ; the limb in the plant described 

 by Cav. is entire and reflexed, but in the plant described by 

 Kunth, the limb is plicately 5-cleft, and the segments mucronate. 

 Seeds oblong, black, downy. 



Bracteaie-ftowered Exogonium. Shrub, tw. 



2 E. FILIFORME (Choisy, 1. c.) leaves oblong-cordate, obtuse, 

 mucronate ; peduncles racemose, filiform. Ij . / ~ > . S. Native 

 of Martinico and the Antilles, in woods. Ipomce'a filiformis, 

 Jacq. amer. p. 27. t. 19. pict. p. 20. t. 26. Willd. spec. 1. p. 

 883. Convolvulus filiformis, Desr. in Lam. diet. 3. p. 555. 

 Plant quite glabrous. Racemes loose-flowered. Flowers purple, 

 copious. Calyx small, acute. Corolla with a very long tube, 

 and obtuse segments. Filaments 5, exceeding the corolla, alter- 

 nating with 5 sterile ones, which are much shorter. 



Filiform Exogonium. Fl. Sept. Oct. Clt. 1823. Sh. tw. 



3 E. REPA'NDUM (Choisy, 1. c.) leaves cordate, oblong, repand, 

 acuminated ; peduncles branched, cymose. I; . / " > . S. Native 

 of South America and Martinico. Ipomce'a repanda, Jacq. . 

 amer. 28. t. 20. pict. t. 27. Sal. par. t. 81. Convolvulus re- 

 pandus, Desr. in Lam. diet. 3. p. 555. Plant quite glabrous. 

 Stem terete. Lower leaves sometimes 3-lobed, all glaucous be- 

 neath. Peduncles length of leaves ; partial ones often trichoto- 

 mous. Flowers scarlet, 2 inches long. Calyx the same colour 

 as the corolla, small, obtuse. Limb of corolla reflexed; seg- 

 ment narrow, obtuse. 



Repand- leaved Exogonium. Fl. Feb. Nov. Clt. 1793. 

 Shrub, tw. 



Cult. All the species of this genus are elegant and singular. 

 Light rich soil, or a mixture of loam and peat, or decayed 

 leaves and loam suits them best. They are well adapted for 



