120 MYRTACE/E. [Acmena. 



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

 and Arn., a S. Chinese plant, referred here with doubt by Seemann, 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 Syzygium, allied to S. buxifo- 

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

 not yet been found in Hongkong. 



4. JAMBOSA, DC. 



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

 above the ovary, with 4 or rarely more distinct lobes or teeth. Petals 4, or 

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

 celled, with several ovules in each cell. Berry and seeds of Syzygium. — Trees 

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

 lary 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. rf. 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 showy, in a 

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

 the free part campanulate, with broad rounded lobes. Petals full ^ in. long, 

 orbicular. Berries globular, 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 free portion quite 

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

 ting irregularly. Petals 4 or 5, free. Stamens numerous. Ovary 2- or more 

 celled, with many ovides in each, inserted on bifid axile placentas. Fruit a 

 berry. Seeds several, kidney-shaped or horseshoe-shaped. Embryo curved, 

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

 site. Flowers solitary or few together, on axillary peduncles. 



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

 Old World. 



1. P. Guyava, Linn. Sp. PI. ed. 1, 470. A tree, pubescent on the young 

 branches. Leaves on very 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 axillary, \ to 1 in. long, 

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

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

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

 Gnava. — P. pomiferum and P. pyriferum, Linn. ; DC. Prod. iii. 233 and 234. 



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

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



6. EHODOMYETUS, 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, free, spreading. 



