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Prostrate Plants with Tiny Pink Flowers

Posted by jekeesl Central AR 7b (My Page) on
Sun, Oct 27, 13 at 23:09

The prostrate plants to the right of the binoculars had leaves about a half inch long. They were in a wooded depression that usually stays wet. The leaves were opposite at nodes and whorled at stem ends. The pink flowers were sessile at nodes and in groups of 1 to 3. The four petals were equal-sided triangular in shape and about the size of the head of a pin. Most of the plant was covered in short hairs. Fruits were round when young, but dramatically widened as they matured. A flower is shown at the center of the second photo. The last photo shows a mature fruit and the red buds of two unopened flowers.

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Follow-Up Postings:

RE: Prostrate Plants with Tiny Pink Flowers

Stellaria sp?

RE: Prostrate Plants with Tiny Pink Flowers

I believe it's Diodia virginiana, Virginia buttonweed.

If it is a Diodia, then your tiny pink flower would have to be ... maybe the base of a seed capsule whose top has fallen off? And your unopened flower buds would be less mature seed capsules. (It's trying to take over my front lawn, but I haven't studied its anatomy in detail.)

In any case, it seems unlikely there would be unopened buds and nearly-mature seed capsules cheek-by-jowl on the same part of the stem. You could go back and dissect those parts of the plant, to see what's inside.

Nice photos here:

Also here, but unfortunately not of the seed capsule: FLORAbyMAX/ Family-pdfs/ FLORA-P-Z/ Rubiaceae (Madder Family).pdf

RE: Prostrate Plants with Tiny Pink Flowers

Doesn't seem to be Stellaria, because those are petiolate. Not Diodia virginiana, because that usually has two sepals. Not D. teres either (lacks those bristles under the flowers and fruit). Those pink flowers and fruits remind me of Rotala ramosior. I wonder if this is Rotala indica? That species is prostrate, has 2-valved capsules, and leaves of similar size. Anybody familiar with that Asian import?

RE: Prostrate Plants with Tiny Pink Flowers

Think these are bloomed out, as missingtheobvious said, and that the true ID is likely Oldenlandia boscii. It seems to be a full match.

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