Blechum pyramidatum
[Browne's Blechum, Green Shrimp Plant]

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Close-up views:

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In Singapore, this plant is sold in plant nursery as 夏枯草 (Prunella vulgaris). However, this plant is not Prunella vulgaris. There is very little information on the status of Blechum pyramidatum in Singapore although it had been cultivated as a herb. The name of this plant was mentioned in a local publication [1] based on a flora survey done at the Upper Thomson Forest in 2012. However, no picture of this plant was shown in the article. Another source that mentioned this plant was from a blog posted in 2009 on sighting in Seletar area. However, the plant named as Blechum pyramidatum should be Nelsonia canescens (Blue Pussyleaf) instead. In the local plant pictorial guide (Plants in Tropical Cities) published in 2014 (page 665), this plant was also named as Prunella vulgaris.

Reference:

[1] Neo L, Yee ATK, Chong KY, Tan HTW. The vascular plant flora of Upper Thomson Forest. Nature in Singapore 2014;7:55-68. | Read article |

In October 2016, I brought a pot of this plant home to observe it more closely. The fruits are in the form of capsules of about 10 millimetres (mm) long. The matured capsule is being wrapped around with dried and hairy sepals of a similar length. Each capsule houses up to 7 seeds of about 2 mm long. Seeds are dispersed by explosive mechanism of the capsule. The length of the capsule from my plant seemed to be much longer than that showed in the University of Guam website.

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