Euphorbiaceae fortnight :: Euphorbia thymifolia L from Assam, KD 10

[Karuna Das]

Dear All,

    Attached images may be Euphorbia thymifolia L. growing with Euphorbia hirta L.. Please validate.

Date :08.11.2013

Location: Kamrup district

Family : Euphorbiaceae

With regards

Karuna Kanta Das

Guwahati 781012

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[Tapas Chakrabarty]

In Euphorbia thymifolia the ovary ripens within the cyathium while in E. prostrata the fruit bursts outside the cyathium.  From your photos, it is therefore E. prostrata.

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[J.M. Garg]

Looks different from E. prostrata as per keys:

Three prostrate species are rather close. I found the following keys in Flora of India:

30 a. Plants prostrate, only branches or tips of branches decumbent; cyathia solitary, paired or 3 together 31
b. Plants erect, decumbent or ascending; cyathia more than 3 in glomerules 33
31 a. Stems and branches pinkish grey; mature capsules remaining within the involucre ... 32. E. thymifolia
b. Stems, branches and leaves green, glaucous-green, purplish green or blackish green; mature capsules protruding out from the involucre 32
32 a. Stems, branches and leaves blackish or purplish green; capsules acutely keeled, with ciliate hairs confined to keels only ... 26. E. prostrata
b. Stems, branches and leaves green to glaucous-green; capsules obtusely keeled, glabrous or sparsely hairy all over the surface ... 13. E. heyneana
33 a. Plants glabrous; leaves linear-lanceolate, 3 - 6 mm wide, glabrous to sparsely pilose ... 17. E. hyssopifolia 

Can it be E. heyneana?

Dear All,

Location: Kamrup district

Family : Euphorbiaceae

With regards

Karuna Kanta Das

Guwahati 781012

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With regards,
J.M.Garg

[J.M. Garg]

Or rather may be Euphorbia thymifolia

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With regards,
J.M.Garg