120 MYRTACE.^. [Acmena. 



Near the "Waterfall in the Happy Valley, Champion. The Memecylon nigrescens. Hook, 

 and Aril., a S. Chinese plant, referred here with doubt by Seemaun, is certainly not this 

 species. The specimens have close lateral clusters of very young apparently diseased buds, 

 insufficient for their determination. If the plant is a Myrtacea at all, which is not impro- 

 bable, it most resembles an apparently undescribed S. Chinese Syzyg'mm, allied to S. buxifo- 

 Hum, of which there are specimens from Millett in the Hookerian herbarium, but which has 

 not yet been foimd in Hongkong. 



4. JAMBOSA, DC. 



Calyx-tube turbinate, usually elongated and tapering at the base, produced 

 abovethe ovaiy, with 4 or rarely more distinct lobes or teeth. Petals 4, or 

 rarely more, distinct and spreading. Stamens numerous, free. Ovary 2- 

 celled, ^dth several ovides in each cell. Beriy and seeds of Syzygium. — Trees 

 or shrubs. Leaves opposite, coriaceous. Flowers in terminal or rarely axil- 

 laiy short panicles, often rather large. 



A considerable genus, limited to the tropical regions of the Old "World. 



1. J. vulgaris, BO. Prod. iii. 286; Wight, Ic. ^,435. A glabrous tree. 

 Leaves nearly sessile, lanceolate, acuminate, 4 to 7 in. long, 1 to 1^ in. broad, 

 naiTOwed at the base, coriaceous and veined. Flowers large and show^', in a 

 short terminal panicle or raceme. Calyx-tube elongated in the adherent part, 

 the fi-ee part campanulate, with broad rounded lobes. Petals full \ in. long, 

 orbicular. Bemes globidar, crowned by the lobes of the calyx. 



A native of tropical Asia, much planted about cottages for ornament, and said to be natu- 

 ralized in Hongkong. 



5. PSIDIUM, Linn. 



Calyx-tube ovate and adnate at the base ; the upper fi-ee portion quite 

 entire and closed over the flower in the bud, and coming ofi" entire or split- 

 ting irregidarly. Petals 4 or 5, fi-ee. Stamens numerous. Ovary 2- or more 

 celled, with many ovules in each, inserted on bifid axile placentas. Fi-uit a 

 berry. Seeds several, kidney-shaped or horseshoe-shaped. Embno cm-ved, 

 with a long radicle and short cotyledons. — Trees or slu-ubs. Leaves oppo- 

 site. Flowers solitan^ or few together, on axillan- peduncles. 



The genus is exclusively American, the following species onlv being introduced into the 

 Old World. 



1. P. Guyava, Linn. Sp. PI. ed.l, HO. A tree, pubescent on the young 

 branches. Leaves on ven^ short petioles, ovate or oblong, usually acuminate, 

 3 to 4 in. long, glabrous or nearly so above, softly pubescent underneath, 

 with the principal veins very prominent. Peduncles axillar^^, ^ to 1 in. long, 

 1- or 3 -flowered. Buds ovoid in the adnate part; the fi-ee part also ovoid, 

 but much larger and more or less acuminate or pointed. Petals broad, full 

 ^ in. diameter. Fruit globular or pear-shaped, known under the name of 

 Gunva. — P. pomiferum and P. pyriftrum ,ljm\\.; DC. Prod. iii. 233 and 234. 



Hongkong, Champion, chiefly on roadsides and neai' habitations, Hance, Seemann. A 

 species of American origin, much cultivated in tropical Asia, and readily becomes naturalized. 



6. RHODOMYRTUS, DC. 



Calyx-tube campanulate, not produced above the ovary ; limb of 5, or rarely 

 6 or 4 lobes, broad and reaching to the ovary. Petals as many, fi-ee, spreading. 



