Florida Hammock Sandmat

Euphorbia ophthalmica

Description 4

Plants prostrate to ascending annuals (usually ascending when growing with potted plants); hairy; plants observed in pots on the Llano up to 10-15 cm tall but most plants observed 7-10 cm tall. Stem hairs tomentose to woolly to villous, on Llano usually toward tomentose; largest internodes up to 1 mm on plants observed in pots on Llano; terminating in a pair of glomerules. Stipules divided. Leaves unequal rhombic-lanceolate; surface rugose; margins serrated. Cyathia held in glomerules of more than 15 cyathia; cyathia very small, about 0.5 mm across. Appendages present but inconspicuous. Cyathia and appendages usually brown or tannish. Glands a dull pinkish. Fruits about 1 mm long with strigose hairs. Seeds with 4-5 shallow transverse ridges or wrinkles.

Comments 4

This and E. hirta can easily be distinguished from other species by their rugose, rhombic-lanceolate leaves and dense glomerules (the round inflorescences of cyathia) of small cyathia. Euphorbia hirta is a similar species that shares the tendency to travel long distances as weeds with E. ophthalmica. Consequently, E. hirta has become a pan-tropical weed. Euphorbia ophthalmica can be distinguished by the stems that terminate in a pair of glomerules instead of bearing glomerules along the stem. Euphorbia hirta also has a habit and leaf size more like that of E. hyssopifolia or E. hypericifolia.

Sources and Credits

  1. (c) Linda Jo, some rights reserved (CC BY-NC), uploaded by Linda Jo Conn, http://www.inaturalist.org/photos/2326720
  2. (c) Linda Jo, some rights reserved (CC BY-NC), uploaded by Linda Jo Conn, http://www.inaturalist.org/photos/2326713
  3. (c) nathantaylor, all rights reserved, uploaded by Nathan Taylor, http://www.inaturalist.org/photos/5167461
  4. (c) Nathan Taylor, some rights reserved (CC BY-SA), http://www.inaturalist.org/guide_taxa/346754

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