MELASTOMACE/E. XXIII. RHEXIA. XXIV. HETERONOMA. XXV. PACHYLOMA. XXVI. OXYSPORA, &c. 747 



leaves sessile, erect, narrow-lanceolate, tapering into an acumen 

 at the apex, 3-nerved, glabrous on both surfaces ; corymbs 

 dicliotomous ; calyxes smoothish. I/ . H. Native of Georgia 

 and Lower Carolina, in humid places. Flowers purple. Very 

 like the variety of R. glabella according to Nutt. gen. amer. 

 Straight Rhexia. PL ~ to 1 foot. 



7 R. U/TEA (Michx. fl. bor. amer. 1. p. 222.) stem quadran- 

 gular, hispid ; leaves furnished with a few long hairs, lower ones 

 cuneate-oblong, obtuse ; upper ones lanceolate ; calyx margi- 

 nated, with the lobes acute ; anthers short. If. . F. Native of 

 Georgia and Florida. Flowers yellow. Petals oval, obtuse. 



JW/on>-flowered Rhexia. PL 5- to f foot. 



8 R. ANGUSTIFOLIA (Nutt. gen. amer. 1. p. 244.) stem nearly 

 terete, hairy ; leaves linear-lanceolate, sometimes oblong, hairy, 

 bearing smaller leaves in the axils ; flowers cymose ; cymes 

 bifid ; calyx cylindrical, short, smooth ; stamens declinate. 1(. . 

 H. Native of Georgia and Carolina. R. lanceolata, Walt. fl. 

 car. 129. Poir. diet. ency. 6. p. 2. R. Mariana y exalbida, 

 Lam. ill. t. 288. f. 3. Michx. fl. bor. amer. 1. p. 221. Flowers 

 middle-sized, white. 



Narrow-leaved Rhexia. Fl. June, Aug. Clt. 1812. PI. |ft. 



N. B. Rhexia linearif olia of Poir is Isnardia alternifblia. 



Cult. All the species of this genus are very elegant when in 

 flower, and if planted in a bed of peat soil (which is the only 

 soil in which they grow) they will thrive and increase abun- 

 dantly ; and if grown in pots, which is sometimes the case, they 

 must be planted in peat soil. They are all increased by dividing 

 at the root, 



XXIV. HETERONO'MA (from Irtpoc, heteros, and rwpa, 

 aros, noma, atos ; original form; inequality of leaves). D.C. 

 prod. 3. p. 122. 



LIN. SYST. Octdndria, Monogynia. Calyx tubular, with 4 

 triangular, acute, permanent teeth. Petals 4, oval, somewhat 

 mucronate. Stamens 8. Anthers alternately longer ; in the 

 longer anthers the connective is drawn out into a linear appen- 

 dage, which is bifid at the apex ; in the smaller or shorter ones 

 it is drawn out into 2 bristles. Capsule 4-celled, equal in length 

 to the calyx. Seeds cochleate, compressed, wrinkled trans- 

 versely, scabrous, the stripes on the back parallel. A glabrous 

 herb. Branches tetragonal. Leaves petiolate, ovate, acute, 5- 

 nerved, ciliately serrated, opposite, very unequal in size, the one 

 large and the other small. Cymes corymbose, few-flowered, 

 loose, terminal. Flowers elegant, rose-coloured. 



1 H. DIVERSIFOLIUM (D. C. prod. 3. p. 122.) y.. S. Native 

 of Peru ex herb., Dombey, and of Mexico. Rhexia diversifolia, 

 Bonpl. rhex. t. 45. Rhtixia inasqualifolia, Moc. et Sesse, fl. 

 mex. ined. t. 334. 



Diverse-leaved Heteronoma. PI. 2 feet. 



Cult. Peat is the best soil for this plant ; and cuttings will 

 root in the same kind of earth under a hand-glass, in heat. 



XXV. PACHYLO'MA (from ira-xys, pachys, and Xtofia, 

 loma, a fringe ; in reference to the thick marginal nerve of the 

 leaf). D. C. prod. 3. p. 122. 



LIN. SYST. Octdndria, Monogynia. Tube of calyx obconi- 

 cally cylindrical, drawn out beyond the ovarium ; limb some- 

 what truncate, hardly 4-toothed. Petals 4, oval. Stamens 8, 

 equal. Anthers linear, elongated, acuminated, opening by one 

 pore ; having the connectives in 4 of them long and drawn out into 

 a simple bristle-like appendage ; in the other 4 it is drawn out 

 into 2 bristle-like appendages. Ovarium free, 4-ribbed, gla- 

 brous. Style filiform, exserted. Stigma dot-formed. Fruit 

 unknown. Smooth Brazilian shrubs. Branches terete, nodose 

 at the insertion of the leaves. Leaves on short petioles, oval, 5- 

 nerved, besides being margined by a thick nerve, coriaceous, quite 



entire. Thyrse panicled, loose, terminal, bractless. Flowers 

 purple. The character of this genus is very doubtful, from the 

 fruit being unknown, but the habit is very singular. 



1 P. CORIA'CEUM (D. C. 1. c.) I? . S. Native of Brazil, in 

 the province of Rio Negro, and at the river Amazon. Rhexia 

 pachyloma, Mart. herb. 



Far. a, glaberrima (D. C. 1. c.) calyxes glabrous ; leaves ob- 

 long. Rhexia bicuspis, Schrank, mss. 



Var. /3, subsetosa (D. C. 1. c.) calyx covered with glandular 

 bristles ; leaves ovate. Rhexia Amazonium, Schrank, mss. 



In both varieties the leaves vary in the same specimen, and are 

 cleft in a singular manner at the apex, the points cross over each 

 other in the manner of the bill of a cross-beak, Loxia of Lin. 



Coriaceous-leaved Pachyloma. Tree 30 to 40 feet. 



Cult. See Meridnia, p. 733. for culture and propagation. 



XXVI. OXY'SPORA (from ofrs, oxys, sharp, and o-iropa, 

 spora, a seed ; in allusion to the seeds being awned at both 

 ends). D. C. prod. 3. p. 123. Arthrostemma species, D. Don, 

 in wern. soc. mem. 1. c. 



LIN. SYST. Octdndria, Monogynia. Tube of calyx oblong ; 

 lobes 4, ovate, mucronulate. Petals 4, lanceolate, obliquely 

 acute. Stamens 8, equal ; filaments flattish. Anthers elongated, 

 drawn out at the base into 2 blunt spurs, having their connec- 

 tives hardly evident. Capsule 4-celled, 4-valved. Seeds small, 

 hardly curved, awned at both ends : with the hylum con- 

 cave and terminal. Shrubs, native of Nipaul. Leaves pe- 

 tiolate, elliptic, oblong, acuminated, denticulated, 5-7-nerved, 

 glabrous on the upper surface. Thyrse panicled, terminal. 

 Flowers red, drooping. 



1 O. VA'GANS (Wall. pi. rar. asiat. 1. p. 78.) rather climbing; 

 branches nodding ; leaves somewhat cordate-ovate, acuminated, 

 crenulated, ciliated, clothed with tomentose villi on the under 

 surface, as well as on the branchlets and petioles ; panicle elon- 

 gated, nodding ; connectives of anthers all spurred upwards ; 

 calyx ribbed. 17 . G. Native of Chittagong. Melastoma 

 vagans, Roxb. mss. Flowers red. 



Far. ft, cernua (Wall. 1. c.) leaves ovate-lanceolate, 5-nerved, 

 glabrous ; panicle terminal, slender, elongated, nodding ; pe- 

 duncles 4-winged. Tj . S. Native of Chittagong. Melastoma 

 cernua, Roxb. mss. 



Common Oxyspora. Shrub 2 to 4 feet. 



2 O. PANICULA'TA (D. C. prod. 3. p. 123. Wall. pi. rar. asiat. 

 1. p. 78. t. 88.) leaves somewhat cordate-ovate, acuminated, cre- 

 nulated, clothed with villous tomentum beneath as well as on the 

 petioles and peduncles ; panicle ovate, erect ; connectives of the 

 longer anthers obsoletely spurred ; capsule nerveless. Tj . G. 

 Native of Nipaul. Flowers red. D. C. coll. p. 33. t. 4. 

 Arthrostemma paniculata, D. Don, prod. fl. nep. p. 222. 



Panicled-flowered Oxyspora. Shrub 2 to 4 feet. 

 Cult. For culture and propagation see Lasidndra, p. 752. 

 Both are very elegant shrubs when in blossom. 



XXVII. TRICE'NTRUM (from rptie, treis, three, and v- 

 rpov, kentron, a spur ; in reference to the connectives of the an- 

 thers being furnished with three spurs at the base). D. C. prod. 

 3. p. 123. 



LIN. SYST. Octdndria, Monogynia. Tube of calyx ovate ; 

 lobes 4, narrow, acute, usually ending in three bristles each at 

 the apex. Petals 4, oblong or oval. Stamens 8 ; filaments 

 glabrous ; anthers similar, linear, opening by one pore, beaked : 

 having their connectives furnished with 3 spurs each, 2 of the 

 spurs are above and 1 behind. Ovarium free, not bristly at the 

 apex. Style filiform. Capsule ovate, 4-celled. Seeds coch- 

 leate. Small South American shrubs. Flowers rose-coloured, 

 solitary, nearly like those of Rhexia. 



1 T. OVALIFOLIUM (D. C. 1. c.) beset with glandular pili in 

 5 c 2 



