Flora of North America species comparison

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Euphorbia austrotexana var. austrotexana

Euphorbia austrotexana var. carrii
Photo is of parent taxon
Photo is of parent taxon
Stems

10–22 cm.

6–13 cm.
Leaves

blade linear-oblanceolate, apex rounded.

blade linear to slightly lanceolate, apex acute.
Seeds

1.6–1.7 × 1.1–1.3 mm, surface with regular concave depressions.

1.4–1.5 × 1–1.1 mm, surface with irregular and not obviously concave depressions.
Dichasial

bracts reniform-ovate to subdeltate-ovate, base truncate.

bracts broadly ovate-lanceolate, base rounded.
2n

= 26.

Euphorbia austrotexana var. austrotexana

Euphorbia austrotexana var. carrii
Phenology Flowering and fruiting spring. Flowering and fruiting spring.
Habitat Sandy soils. Sandy soils.
Elevation 200–300 m. (700–1000 ft.) 0–200.
Distribution
from FNA
TX
from FNA
TX
Discussion

Variety austrotexana is restricted to Atascosa, Bexar, and Wilson counties. According to M. H. Mayfield (2013), only five documented localities are known.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Variety carrii is restricted to Jim Hogg and Kenedy counties, Texas; M. H. Mayfield (2013) indicated that populations are confined to the South Texas Sand Sheet and apparently occur in the deepest sand areas of the region. B. L. Turner (2011) mistook collections of this taxon for the introduced, Old World E. exigua. The two species are not closely related and can be readily distinguished based on seed morphology.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 299. FNA vol. 12, p. 299.
Parent taxa Euphorbiaceae > Euphorbia > subg. Esula > Euphorbia austrotexana Euphorbiaceae > Euphorbia > subg. Esula > Euphorbia austrotexana
Sibling taxa
E. austrotexana var. carrii
E. austrotexana var. austrotexana
Name authority unknown Mayfield: J. Bot. Res. Inst. Texas 7: 636, fig. 2[row 3, center]. (2013)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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