7.5-2 



MELASTOMACEiE. XXXI. LASIANDRA. XXXII. CHJSTOOAST&A. 



44. Sims, bot. mag. t. 214. Pleroma granulosum, D. Don, 

 wern. soc. mem. 4. p. 293. Melastoma Fontanesianum, Spreng. 

 syst. Rhexia dasystaminea, Schrank, mss. Flowers large, of 

 a rose-purple colour. 



Var. ft, itng&sllor (D. C. 1. c.) leaves not half the breadth ; 

 flowers smaller. 



Desfontain's Lasiandra. Shrub 5 to 8 feet. 



19 L. FISSINE'RVIA (D. C. 1. c.) branches tetragonal, not 

 winged; petioles, peduncles, and leaves beset with adpressed 

 bristles ; leaves petiolate, oblong, acute, 5-nerved or only 3- 

 nerved, with the 2 lateral ones bifid, beset with adpressed bristles 

 on the margins and on the nerves on the under surface, the rest 

 velvety from dense stellate down ; flowers racemose ; peduncles 

 opposite, 1-3-flowered ; calyx clothed with adpressed white 

 pubescence ; filaments hairy ; style glabrous. Tj . S. Native 

 of Brazil, in the province of Minas Geraes. Rhexia fissinervia, 

 Schrank et Mart. mss. Like L. Fontanesiana, but differs in the 

 stem being tetragonal, not winged, in the calyx being less villous, 

 and in the flowers being smaller. 



Cleft-nerved Lasianclra. Shrub 5 to 10 feet. 



20 L. STENOCA'RPA (D. C. 1. c.) branches tetragonal, having 

 the angles rather winged, and are as well as the petioles and 

 peduncles clothed with adpressed stiff villi ; leaves on short 

 petioles, oblong, acute, mucronate, 5-nerved, quite entire, beset 

 with adpressed bristles above, and silky villi beneath ; flowers 

 panicled ; branches of panicle tetragonal, opposite, 3-flowered ; 

 calyx clothed with adpressed villi ; filaments hairy ; style rather 

 pilose. J? S. Native of Brazil, in rocky places near Maraca, 

 in the province of Bahia. Rhexia Estrellensis, Raddi, mem. 

 p. 9. ? Rhexia stenocarpa, Schrank et Mart. mss. Allied to 

 L. Fontanesiana, but differs in the flowers being smaller, and 

 especially in the down, which is very distinct. 



Narrow -fruited Lasiandra. Shrub 5 to 8 feet. 



21 L. LANGSDORFIA'NA (D. C. 1. c.) branches tetragonal, 

 having the angles winged, beset with bristles as well as the pe- 

 duncles ; petioles short, villous ; leaves oval, acute from a mu- 

 crone, 5-nerved, clothed with adpressed bristles above, and with 

 adpressed villi-on the nerves beneath, and soft stellate tomentum 

 between the nerves ; panicle thyrsoid, terminal, many-flowered ; 

 calyx clothed with adpressed white villi, with an ovate tube, and 

 lanceolate, deciduous lobes; filaments and style beset with 

 bristles. T? . S. Native of Brazil, in exposed fields in the 

 provinces of Rio Janeiro and St. Paul. Rhexia Langsdorfiana, 

 Bonpl. rhex. t. 51. Osbeckia Langsdorfiana, Spreng. syst. 2. 

 p. 312. Allied to L. Fontanesiana, but differs in the leaves 

 being ovate at the base, and rather rufescent beneath. Thyrse 

 panicle-formed. Stamens beset with glandular pili. 



Langsdorf's Lasiandra. Shrub 5 to 6 feet. 



22 L. PROTE/EFORMIS (D. C. 1. c.) branchlets acutely tetra- 

 gonal, and are as well as the peduncles beset with bristles ; 

 petioles hardly any, villous ; leaves ovate, mucronate, 5-nerved, 

 densely clothed with adpressed silky villi on both surfaces, the 

 down o.> the under surface stellate ; thyrse panicled, terminal, 

 many-flowered; bracteas and calyxes very villous; lobes of 

 calyx lanceolate, acute ; petals a little ciliated, twice the length 

 of the calycine lobes ; style and filaments beset with a few hairs. 

 J? . S. Native of Brazil, in woods, and in bushy exposed places 

 in the province of Minas Geraes. Rhexia proteseformis, Schrank 

 et Mart. mss. Allied to L. Langsdorfdna, but differs in the 

 flowers not being above half the size, and in the nerves of the 

 leaves being clothed with yellowish villi. 



Pi-otea-f armed Lasiandra. Shrub 5 to 6 feet. 



23 L. URVILLEA'NA (D. C. 1. c.) branches tetragonal, clothed 

 with soft villi ; leaves on short petioles, oval-oblong, mucronate, 

 5-nerved, quite entire, clothed with adpressed silky villi on both 

 surfaces; thyrse panicled, crowded, terminal; bracteas and 

 calyxes very villous ; lobes lanceolate, acute ; filaments and 



style beset with glandular pili, from the base to the middle. 

 fy . S. Native of the island of St. Catharine, in the entrance to 

 the Rio Janeiro, where it was collected by Captain d'Urville. 

 Petals purple, ciliated, almost bearded at the apex. Knots of 

 branches thickly beset with spreading bristles. 

 D'Unille's Lasiandra. Shrub 5 to 6 feet. 



24 L. ADENOSTE'MON (D. C. I.e.) branches tetragonally winged, 

 and are as well as the peduncles clothed with adpressed bristles ; 

 petioles hardly any ; leaves ovate, quite entire, mucronate, 5- 

 nerved, villous above and on the nerves beneath, but clothed 

 with stellate tomentum between the nerves on the under sur- 

 face ; thyrse panicled, terminal ; calyx and bracteas clothed 

 with adpressed villi ; lobes of calyx lanceolate ; filaments and 

 style pubescent and beset with glandular pili at the base ; the 5 

 alternate filaments bearing a few thick pedicellate glands. Tj . S. 

 Native of Brazil, about Rio Janeiro in exposed fields. Me- 

 riania adenostemon, Schrank et" Mart. mss. Habit of L. pro- 

 teceformis, but the stamens are almost that of Macairea. 



Gland-slamencd Lasianclra. Shrub 5 to G feet. 



25 L. ARGE'NTEA (D. C. prod. 3. p. 131.) branches tetragonal, 

 clothed with adpressed bristles; leaves sessile, ovate, 5-7-nerved, 

 quite entire, densely clothed with silky villi on both surfaces ; 

 thyrse panicled, terminal, with the rachis very villous and com- 

 pressed ; calyx tubular ; filaments and style bearing a few pili. 



fj . S. Native of Brazil, about Rio Janeiro. Melastoma ar- 

 gentea, Desv. in Lam. diet. 4. p. 45. Rhexia holosericea, 

 Bonpl. rhex. t. 12. Ker. bot. reg. t. 323. Lodd. bot. cab. 

 t. 236. Delaun. herb. amat. t. 321. Spreng. syst. 2. p. 307. 

 exclusive of the synonyme. Pleroma holosericeum, D. Don, 

 mem. soc. wern. 4. p. 293. Melastoma clavata, Pers. ench. 1. 

 p. 476. Flowers purple. A very beautiful species, and very 

 distinct from the Melastoma holosericea of Lin. and Swartz. 



Silvery Lasiandra. Fl. July. Clt. 1816. Sh. 6 to 10 feet. 



Cult. All the species are elegant shrubs, bearing thyrsoid 

 panicles of large purple flowers. They grow best in a mix- 

 ture of loam, peat, and sand ; and young cuttings root readily 

 if planted in the same kind of soil, placed in heat, under a hand- 

 glass. 



XXXII. CH^ETOGA'STRA (from x -/, chaite, a bristle, 

 and yaoTTjp, gaster, a belly ; in allusion to the tube of the calyx 

 being beset with bristles or scales). D. C. prod. 3. p. 131. 



LIN. SYST. Decandria, Monogt/nia. Tube of calyx turbi- 

 nate, pilose, or scaly; lobes 5, permanent. Petals 5, obovate. 

 Stamens 10, with glabrous filaments and oblong anthers ; anthers 

 opening by 1 pore at the apex ; having their connectives drawn 

 out, sometimes into a simple or bifid spur, and sometimes into 2 

 small, obtuse tubercles. Ovarium free, bristly at the apex, and 

 often denticulated. Capsule 5-celled. Seeds cochleate. Shrubs, 

 rarely herbs, natives of South America, for the most part clothed 

 with strigose pili. Leaves 3-5-nerved, quite entire, or hardly 

 serrulated. Flowers terminal, purple, or white. This genus 

 differs from Lasiandra in the stamens being glabrous, and in 

 the inflorescence ; from Arlhrostemma in the quinary number 

 of the parts of the flower, not quaternary ; from Osbeckia in 

 there being no appendages between the calycine lobes. 



SECT. I. MONOCE'NTRA (from fiovos, monos, one, and Kevrpov, 

 kentron, a spur ; in reference to the anthers having their con- 

 nectives drawn out into a simple spur at the base). D. C. prod. 

 3. p. 131. Tube of calyx obovate or turbinate; lobes 5, 

 lanceolate, rather dilated at the base. Anthers having their 

 connectives drawn out into a simple spur at the base. Ovarium 

 toothed at the apex. Showy Peruvian shrubs, with the habit 

 of Lasiandra. Branches terete. Flowers large, purple. Per- 

 haps a proper genus. 



1 C. SFECIOSA (D. C. 1. c.) branches clothed with short, simple 



