BYTTNERIACE^E. XXIV. MEIHANIA. XXV. TBOCHETIA. XXVI. PTEROSPERMOM. 



537 



DottedAeaved Dombeya. Clt. 1820. Shrub 10 feet. 



12 D. OVA V TA (Cav. diss. 3. p. 127. t. 41. f. 2.) leaves clothed 

 with white tomentum beneath, smoothish above, 3-5-nerved, 

 ovate, acute, toothed ; corymbs bifid ; style very small. TV . S. 

 Native of Bourbon. Shrub clothed with rusty hairs. Flowers 

 whitish, or pale red. 



Ocate-leaved Dombeya. Clt. 1822. Tree 16 feet. 



Cult. All the species of Dombeya thrive well in sandy loam ; 

 and young cuttings will root freely in sand, under a hand-glass, 

 in a moist heat. 



XXIV. MELHA'NIA (from Mount Melhan in Arabia Felix, 

 the habitation of M. velutina). Forsk. descr. 64. Ait. hort. 

 kew. ed. 2. vol. 4. p. 146. D. C. prod. 1. p. 499. 



LIN. SYST. Monadelphia, Decandria. In every respect the 

 same as Dombeya, but with 1 stamens, 5 fertile, and 5 sterile, 

 each of the fertile ones bearing either 1 or 2 anthers. Suffi- 

 ciently distinct from Dombeya. 



1. Fertile filaments bearing 2 anthers each. 



1 M. DECANTHE'RA (D. C. prod. 1. p. 499.) leaves smooth, 

 elliptical, acuminated at both ends, repandly-toothed ; pedun- 

 cles many-flowered, umbelliferous. J? . S. Native of Ma- 

 dagascar. Dombeya decanthera, Cav. diss. 3. p. 126. t. 40. 

 f. 2. Flowers small, white? 



Ten-anthered Melhania. Tree 10 feet. 



$ 2. Fertile filaments, bearing 1 anther each. 



2 M. ERYTHRO'XYLON (Ait. hort. kew. ed. 2. vol. 4. p. 146.) 

 leaves ovate-cordate, somewhat peltate, acviminate, crenulated, 

 tomentose beneath, netted ; peduncles usually 3-flowered. 1? . S. 

 Native of St. Helena in groves. Flowers large, white. Pen- 

 tapetes erythroxylon, Ait. hort. kew. ed. 1. vol. 2. p. 138. Dom- 

 beya erythroxylon, Sims, bot. mag. t. 1000. This tree flowers 

 even when only 1^ foot high. 



Red-wooded Melhania. Fl. May, Aug. Clt. 1772. Tree 15 ft. 



3 M. MELANOXYLON (Ait. hort. kew. ed. 2. vol. 4. p. 146.) 

 leaves cordate, quite entire, tomentose on both surfaces, even ; 

 peduncles usually 3-flowered. ^ S. Native of St. Helena. 

 Pluk. mant. 6. t. 333. f. 5. The involucel in this and M. ery- 

 throxylon soon fall off". Flowers white. 



Black-wooded Melhania. Fl. July, Aug. Clt. 1800. Tree 

 20 feet. 



4 M. DENHA' MII (R. Brown, inDenh. etClapp. trav. appen. p. 

 27.). T? . G. Native of the north of Africa near Soudan. This 

 species differs from all the others in having its bracteas regu- 

 larly whorled, and at the same time longer and much broader 

 than the divisions of the calyx. 



Denham's Melhania. Shrub. 



5 M. VELUTI'NA (Forsk. descr. 64.) leaves ovate-lanceolate, 

 serrated, tomentose ; umbels axillary, simple, 4-flowered. f? . G. 

 Native of Arabia Felix on Mount Melhan, whence the generic 

 name. Pentapetes velutina, Vahl. symb. 1. p. 49. Dombeya 

 velutina, Willd. spec. Flowers yellow. 



Velvety Melhania. Shrub 3 to 6 feet. 



6 M. BURCHE'LLII (D. C. prod. 1. p. 499.) leaves oblong- 

 linear, bluntish, somewhat serrated, velvety and hoary on both 

 surfaces; pedicels axillary, 1-flowered, length of petioles. Ij . G. 

 Native of the Cape of Good Hope. Melhania, Burch. cat. no. 

 241 7. Flowers white ? 



Bmchell's Melhania. Clt. 1818. Tree 15 feet. 



7 M.? PROSTKA'TA (D. C. prod. 1. p. 499.) leaves linear, 

 entire, smooth above, hoary beneath ; pedicels axillary, 1- 

 flowered, twice or thrice as long as the petioles. ^7 . G. Native 

 of the Cape of Good Hope. Dombeya prostrata, Burch. cat. no. 

 2153. Flowers not seen. 



Prostrate Melhania. Shrub prostrate. 



VOL. I. PART. VI. 



Cult. Melhania is a beautiful genus of shrubs and trees. 

 They will grow well in a mixture of loam, peat, and sand, and 

 cuttings will root in the same kind of soil, under a hand-glass, 

 in heat. They are all liable to be covered with insects, such as 

 the mealy bug, scale, and red spider, which should be carefully 

 cleaned off, or the plants will not thrive. 



XXV. TROCHE' TI A (in memory of M. Du Trochet, a ve- 

 getable physiologist). D. C. mem. mus. 10. p. 106. prod. 1. 

 p. 499. 



LIN. SYST. Monadelphia, Polydndria. Calyx 5-parted (f. 

 92. a.), spreading, naked. Petals 5 (f. 92. &.). Stamens 20-25, 

 monadelphous at the base (f. 92. c.), 5-7 of which are sterile 

 (f. 92. d.). Ovary (f. 92. e.) 1, roundish, scaly. Style filiform 

 (f. 92. /.). Capsule 5-celled, 5-valved. Seeds small, roundish, 

 wingless. Shrubs with entire leaves, which are rusty or scaly 

 beneath and axillary, 1 -3-flowered, drooping peduncles. 



FIG. 92. 



1 T. UNIFLORA (D. C. mem. 

 mus. 10. p. 106. with a figure), 

 leaves ovate, somewhat acute, 

 twice as long as broad ; peduncles 

 1-flowered. Jj . S. Native of 

 the Island of Bourbon. Flowers 

 white or pale-red (f. 92.). 



One-flowered Trochetia. Tree 

 20 feet. 



2 T. TRIFLORA (D. C. 1. C. With 



a figure) leaves ovate-lanceolate, 

 acuminated, 4-times as long as 

 broad ; peduncles 3-flowered ; 

 flowers rising from the top of the 

 peduncle, middle pedicel naked, 

 lateral ones each furnished with a 

 bractea. fj.S. Native of the Is- 

 land of Bourbon. Flowers white 

 or pale -red ? 



Three-flowered Trochetia. Tree 20 feet. 



Cult. These trees will succeed well in a mixture of loam 

 and peat ; and young cuttings will strike root freely in the 

 same kind of soil under a hand-glass, in a moist heat. 



XXVI. PTEROSPE'RMUM(from7rrpov,^ero,awing,and 

 (TTTEp/ia, sperma, a seed ; in allusion to the seeds being winged). 

 Schrceb. gen. no. 1124. D. C. mem. mus. 10. p. 111. prod. 1. 

 p. 500. 



LIN, SYST. Monadelphia, Polydndria. Calyx 5-parted, 

 somewhat tubular at the base, naked or involucrated. Petals 

 5, usually shorter than the sepals. Stamens 20, 5 of these are 

 sterile. Style cylindrical. Stigma thickish. Capsules woody, 

 5-celled. Seeds drawn out into a wing. Albumen sparing or 

 wanting. Trees with large leaves, which are usually hoary 

 beneath, and large, axillary or terminal, solitary flowers. 



SECT. I. VEIA'GA (meaning unknown). Adans. fam. 2. p. 

 389. D. C. prod. 1. p. 500. Involucel wanting. 



1 P. ACERirbLiuM (Willd. spec. 3. p. 729.) leaves broad, pel- 

 tately-cordate, obtuse, with a short acumen, toothed, tomentose 

 beneath ; pedicels shorter than the petioles. Tj . S. Native of 

 the East Indies. Sims, bot. mag. t. 620. Pentapetes acerifolia, 

 Lin. spec. 939. Cav. diss. 3. p. 131. t. 44. Velago f xyloc6rpa, 

 Gaert. fr. 2. p. 245. t. 133. Amm. act. petr. 8. t. 16 and 17. 

 Flowers white. 



Maple-leaved Pterospermum. Fl. July, Sept. Clt. 1790. 

 Tree 25 feet. 



2 P. SUBERIFOLIUM (Willd. spec. 3. p. 728.) leaves oblong, 

 acuminated, obliquely cordate at the base, coarsely toothed at 



3 Z 



