trees, 5-10 m tall, stems often basally many branched, epiphytic when young.

1、

ovules 1 or 2(or more), pendulous, laterally or basally, rarely subapically attached.

胚珠1或者2（或更多），倒生，侧部或者基部，很少顶部合生。

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2、

leaf basally cuneate; fruit sanguine, ca. 1 cm in diam.

基部的叶楔形；血红色的果，直径约1厘米。

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3、

petals 5, much smaller than sepals, basally tubulose or shallowly scrotiform and shortly clawed.

花瓣5，比萼片小得多，浅囊状或和短爪。

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4、

secondary veins 7-10 on each side of midvein, basally straight, curved upward and anastomosing before margin.

次脉7-10在中脉两边各，基部直，向上弄弯和在叶缘前网结。

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5、

petals white, suborbicular, ca. 2. 5 cm, outside basally sericeous.

花瓣白色，近圆形，约2.5厘米，在被绢毛基生外边。

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6、

filaments basally connate, forming a column ca. 2 mm.

花丝基部合生，形成一柱状的约2毫米。

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7、

ovules 2 per locule, basally attached, erect.

胚珠2每室，基部着生，直立。

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8、

stems 3--15 cm tall, usually branched near base, basally and lower stem with sheath like scales.

茎3-15厘米高，通常分枝近基部，基部和下部茎具鞘状鳞片。

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9、

racemes 30-80(-100)-flowered, bracteate basally to almost throughout, elongated considerably in fruit.

总状花序30-80（-100）花，具苞片基部到几乎全部，在果期相当大拉长。

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10、

stems yellow, 10--40 cm, slender, shiny, with long filiform hairs, basally glabrous.

黄的茎，10-40厘米，纤细，发亮，具长丝状毛，基部无毛。

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11、

stems 1 to several, erect, branched basally or unbranched, pubescent, with 4 lines of hairs.

茎1到数个，直立，不分枝的或，短柔毛，具4行毛的基部分枝。

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12、

calyx lobe margin narrowly membranous; leaf blade toothed to lobed, rarely basally 1- or 2-segmented.

萼裂片边缘狭膜质；叶片齿对浅裂，1或2裂片的很少基部。

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13、

stems erect or ascending, quadrangular, 40--60 cm tall, basally branched, densely woolly.

茎直立或上升，四棱，40-60厘米高，基部分枝，密被绵毛。

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14、

petals 5, white or yellowish, basally slightly connate.

花瓣5，白色或者淡黄，基部稍合生。

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15、

petals 5, white, imbricate in bud, basally slightly connate.

花瓣5，白色，在芽期覆瓦状排列，基部稍合生。

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16、

flowers bisexual. sepals 4, distinct or basally connate.

花两性萼片4，离生的或基部合生。

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17、

sepals 5, imbricate, persistent, basally connate. petals 5, white or yellowish white, imbricate, basally slightly connate.

花瓣5，淡黄白色，覆瓦状的白色的或，基部稍合生。

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18、

bracts linear-lanceolate, margin often entire but basally sometimes with 1 or 2 short to rarely long teeth, apex obtuse.

苞片线形披针形，全缘的边缘通常但是有时基部具1或2去很少长齿的短，先端钝。

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19、

8 (7) stipules usually basally connate, enclosing bud, leaving a single transverse scar that completely encircles stem at each node.

托叶通常基部合生，包围芽，在每节上留下单个的完全环绕茎的横裂痕。

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20、

filaments basally connate, forming a short column.

花丝基部合生，形成一根短柱子。

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