NEW CHIHUAHUAN UMBELLIFERAE 
BY 
LINcoLN ConsTaNCE' AND Ropertr A. Byes, Jr.’ 
Our knowledge of the Umbelliferae of the Mexican 
Kstado de Chihuahua began apparently with Wislizenus’ 
pioneer journey to northern Mexico just before the mid- 
dle of the 19th Century, which yielded Hryngium hetero- 
phyllum Kngelm. The activities of the 1880s’ of those 
two doughty American collectors, Palmer and Pringle, 
led to the description of Arracacia edulis S. Wats., 
vryngium madrense S. Wats., Hulophus tenuifolius S. 
Wats., LZ. ternatus S. Wats., Museniopsis ternata var. 
Ailifolia C. & R., Prionosciadium madrense 8. Wats., and 
P. Pringle: S. Wats. A spate of field investigations at 
the turn of the century by Goldman, Nelson, M. E. 
Jones, and ‘Townsend and Barber led to the discovery 
of Contoselinum mexicanum C. & R., Eryngium fluitans 
M.E. Jones, 7. Goldmanii Hemsl., 7. medium Hemsl., 
Ligusticum Goldmani C. & R., L. madrense C. & R., 
L. Nelsonu C. & R., Museniopsis pubescens C. & R., and 
Prionosciadium Townsendi C. & R. Inthe 1980s’ there 
was another wave of collecting by Gentry, LeSueur, 
Muller and Pennell. Gentry’s intensive study of Rio 
Mayo plants led to the description of Hryngium calaster 
Standl. Up to the present, some thirty taxa of Umbel- 
' Department of Botany, University of California, Berkeley, Cal. 
* Botanical Museum, Harvard University, Cambridge, Mass. 
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