7.30 



MELASTOMACE.E. XXXIII. ARTHROSTEMMA. 



terminated by a bristle each). D. C. prod. 3. p. 135. Petals 4, 

 oval, each terminated by a bristle. Anthers 8, equal, having 

 their connectives not appendiculated. Ovarium 4-toothed at 

 the apex. Capsule <l-celled. Seeds reniform, not truly coch- 

 leate. Herbs, suffruticose at the base. Flowers white or yel- 

 low. Perhaps this section is sufficient to form a proper genus. 



1 A. ANGUSTURE'NSE (D. C. 1. c.) herbaceous; leaves lan- 

 ceolate, 3-nerved, quite entire, pilose on both surfaces ; flowers 

 terminal, almost solitary ; calyx clothed with stellate down. If. . 

 S. Native on the banks of the Orinoco, near Angustura. 

 Rhexia Angusturcnsis, Bonpl. rhex. p. 77. t. 29. Flowers 

 white. Genitals hardly longer than the petals. Anthers linear, 

 falcate. 



Angusiura Arthrostemma. PI. 2 to 3 feet. 



2 A. PILOSELLOIDES (D. C. prod. 3. p. 136.) suffruticose at 

 the base ; leaves crowded at the roots, lanceolate, quite entire, 

 7-nerved, pilose ; stem almost a scape, loosely panicled, few- 

 flowered ; calyx pilose. Jj . S. Native of New Granada, in 

 cold places at the elevation of 3900 feet. Rhexia piloselloides, 

 Bonpl. rhex. p. 12. t. 5. Flowers yellow, spreading. Style 

 short, rather clavate. 



Mouse-ear-like Arthrostemma. PI. to foot. 



SECT. II. BRACHYOTUM (from flpa-xys, brachys, short, and 

 ovc UTOS, ous otos, an ear ; auricles of the connectives of the an- 

 thers short). D. C. prod. 3. p. 136. Calyx 4-cleft, without 

 any appendages. Petals 4, subaristate, usually convolute. Con- 

 nectives of anthers furnished with 2 short auricles each. Ova- 

 rium bearing bristles at the apex, not 4-toothed. Capsule 4- 

 celled. Sufiruticose plants. 



3 A. ROSMARINIFOLIUM (D. C. 1. c.) shrubby ; branches terete, 

 echinated ; leaves nearly sessile, oblong-linear, 3-nerved, with 

 revolute quite entire edges; peduncles 1-5-flowered, pendulous; 

 calyx hispid ; petals convolute. fj . S. Native of Peru, on 

 arid hills. Rhexia rosmarinifolia, Ruiz et Pav. fl. per. 3. p. 

 84. t. 318. f. a. Leaves small, numerous. Flowers violaceous, 

 spreading in the night and morning. Style exserted, rather 

 clavate. 



Rosemary-leaved Arthrostemma. Shrub 1 to 2 feet. 



4 A. LUTE'SCENS (D. C. 1. c.) shrubby ; branches rugged, 

 pilose ; hairs thick, stiff, short ; leaves ovate, 3-nerved, curled 

 a little, white beneath ; peduncles 3-flowered ; calyx pilose ; 

 petals convolute. Jj . S. Native of Peru, on the mountains. 

 Rhexia lutescens, Ruiz et Pav. fl. per. 3. p. 84. t. 319. f. a. 

 Leaves small, firm ; when in a dry state they are olive-coloured 

 above, and yellowish beneath. Calyx purplish, with lanceolate 

 teeth. Petals yellowish. 



Yellowish Arthrostemma. Sh. 2 feet. 



5 A. QUINQUENE'RVE (D. C. 1. c.) shrubby, much branched ; 

 branches tetragonal, beset with adpressed bristles ; leaves petio- 

 late, ovate, acute, quite entire, S-nerved, bristly above, but vil- 

 lously tomentose beneath ; peduncles axillary and terminal, 

 many-flo'.vered, inflexed at the apex ; flowers drooping ; calyx 

 bristly, with an ovate tube, shorter than the lobes, which 

 are setaceous. ^ S. Native of Peru, on mountains and 

 hills. Rhexia quinquenervis, Ruiz et Pav. fl. per. 3. p. 83. 

 t. 321. f. 3. Petals almost conniving into a tube, ciliated. Con- 

 nectives of anthers furnished each with 2 very short auricles. 

 Capsule 4-valved, bristly at the apex. Style exserted. 



Five-nerved-\eaveA Arthrostemma. Sh. 6 feet. 



6 A. CAMPANULA^ (B.C. I.e.) shrubby; branches clothed 

 with rufous down; leaves ovate, 5-nerved, quite entire, very 

 hispid above, but tomentose beneath ; flowers drooping, cam- 

 panulate ; calyx pilose, tj . S. Native of Peru, in cold places 

 near Loxa, at the elevation of 3000 feet. Rhexia campanulas, 

 Bonpl. rhex. p. 35. t. 14. Petals deep purple or violaceous, 



awned. Style thickened at the apex. Capsule globose. This 

 plant appears to be intermediate between the first and the pre- 

 sent section. 



Campanulate-fiowered Arthrostemma. Sh. 4 feet. 



SECT. III. LADANOPSIS (from Xataroi-, ladanon, the ladanum 

 bush, and o^ic, apsis, resemblance ; plants with the habit of 

 Cistus ludamfcra or ladanum-tree). D. C. prod. 3. p. 136. 

 Calyx 4-cleft. Petals 4, obovate, expanded. Connectives of 

 anthers rather long, furnished with two short auricles at the 

 base of each. Capsule 4-celled, bristly at the apex. Seeds 

 cochleate. Herbs or subshrubs. 



7 A. LADANOIDES:(D. C. 1. c.) plant herbaceous, erect; hairs 

 or strigae on the steins and leaves adpressed, but those on the 

 calyx are spreading, and in fascicles ; stem tetragonal ; leaves 

 on short petioles, lanceolate, acuminated, ovate at the base, 3- 

 nerved, serrulated ; pedicels elongated, loose, axillary, 1 -flow- 

 ered, and terminal 3-flowered; tube of calyx ovate, longer than 

 the lobes, which are oblong and ciliated. O- S. Native of 

 Brazil and Guiana, in marshes. Rhexia hispida, Rich, in act. 

 soc. hist. nat. par. 1791. p. 108. Rhexia ladanoides. Rich, in 

 Bonpl. rhex. t. 27. Rhexia uda, Mart. herb. Melastovna tricho- 

 tomum, Willd. ined. ex herb. mus. par. Anthers oval, truncate, 

 short, rather dissimilar, especially 4, having short connectives, 

 and 4 with longer ones. Ovarium bristly, 4-celled. Seed coch- 

 leate. Flowers purplish. 



Ladanum-like Arthrostemma. PI. 1 to l^foot. 



8 A. HERBA'CEUM (D. C. prod. 3. p. 137.) herbaceous; stem 

 tetragonal, covered with minute hairs ; leaves on short petioles, 

 ovate-lanceolate, acuminated, crenulately serrated, villous above, 

 but clothed with hairy tomentum beneath ; cymes on long pe- 

 duncles, axillary, 3-flowered ; calyx villous, with 4 ovate 

 ciliated lobes ; anthers rather dissimilar. 0. ? S. Native of 

 Brazil, in woods, in the province of Rio Janeiro and Minas 

 Geraes, but rare. Rhexia herbacea, Schrank et Mart. mss. 

 Petioles hairy. Petals obovate-oblong, when young ciliated at 

 the apex. Anthers 8 oblong, with smooth beaks, the 4 longest 

 having straight connectives, and the 4 shortest arched ones. 



Herbaceous Arthrostemma. PI. 1 foot. 



9 A. HIRSUTI'SSIMUM (D. C. 1. c.) herbaceous, erect ; stem 

 tetragonal, very hairy from long, rather bristly, spreading, some- 

 what retrograde hairs ; leaves on short petioles, lanceolate, acu- 

 minated, crenulately serrated, densely clothed with adpressed 

 villi ; cymes on long peduncles, axillary, 3-flowered ; calyx vil- 

 lous, with 4 ciliated lobes ; anthers dissimilar. Q. S. Native 

 of Brazil. Very like A. herbaceum, but differs in the hairiness. 

 Ovarium bristly at the apex. Seeds cochleate. 



Very-hairy Arthrostemma. PI. 1 foot. 



10 A. MARTIUSIA V NL T M (D. C. 1. c.) stem erect, hairy, almost 

 herbaceous, oppositely and paniculately branched ; branches 

 quadrangular ; leaves on short petioles, ovate-lanceolate, acute, 

 serrulated, 5-nerved, beset with adpressed strigae above, but 

 with soft villi beneath ; peduncles dichotomous, 3-7-flowered. 

 1(..?S. Native of Para, in Brazil. Rhexia paniculata, Mart. 

 herb, and Schrank, mss. but not Hamilt. Rhexia Martiusiana, 

 Ser. mss. Rhexia cerastiif olia, Schrank, et Mart. mss. Tube 

 of calyx ovate, rather pilose ; lobes 4, acute. Petals ovate, 

 purple, pilose on the back. Anthers articulated at the base ; 

 the articulation distant from the cells, and tumid on one side. 

 Ovarium bristly at the apex. 



Martins' s Arthrostemma. PI. 1 to 2 feet. 



1 1 A. POLYGONOIDES (D. C. 1. c.) sufFruticose ? branches 

 loose, tetragonal, beset with a few slender adpressed bristles ; 

 leaves on short petioles, oblong, quite entire, 3-nerved, beset 

 with adpressed bristles on both surfaces ; flowers axillary, soli- 

 tary, almost sessile ; lobes of calyx 4, rarely 5, longer than the 



