Acalypha siamensis

Acalypha siamensis Oliv. ex Gage

Recent Synonyms: None relevant.

Status: Exotic; Naturalized (Teo et al., 2011b). Cultivated.

Growth Form or Habit: Shrub to 2.5m.

IMG_1089
Bukit Batok Nature Park; 2010.

Leaves: Alternate, simple, elliptic to obovate, serrated margins.

Flowers: bisexual spike; female flowers at the base of the spike, subtended by large bracts with toothed margins; male flowers toward the end of the spike, subtended by minute bracts. Flowering throughout the year (except December?).

IMG_1088
Bukit Batok Nature Park; 2010.

Fruits: globose to oblate, trilobed, spiny. Either dispersed by mechanical (explosive dehiscience?) or by exozoochory?

IMG_1411
Kent Ridge; 2011.

IMG_1412
Kent Ridge; 2011.

IMG_1415
Kent Ridge; 2011.

Habitat: Abandoned plantations and abandoned or poorly maintained urban areas.

Occurence: Wild populations can be found in many parts of Singapore (Teo et al., 2011b).

Other information: An updated Australian Weed Risk Assessment by Teo et al. (2011b) gave this species a score 3, followed by a second screen which concluded that this species is of low risk.

More pictures can be found at

(1) Urban Forest website

(2) The Plant Observatory website

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