Euphorbia Lanj.

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PLANTS OF MEXICO
EUPHORBIACEAE
Chamaesyce iohnstonii (Mayfield) Mayfield ined.
dsti Ki H• Mavfield. 1993
NUEVO LEON: 0.9 road mi N of Vallecillos
center on the Monterrey/N. Laredo free route;
adjacent El Fresno; stoney calichified loam
soil; area dominated by Leucophyllum and
with Karwinskia humboltiana and Prosopis sp.
255 m; N26 39’54M W99 58’35M
Very common perennials with swollen underground
rhizomes; sometimes with several aboveground
plants connected underground.
16 Jan, 1993
Mark H. Mayfield 1701
with Burford L. Westlund
UNIVERSITY OF TEXAS HERBARIUM (LL, TEX)
04029401