CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 
UNIVERSITY. — NEW SERIES, No. LIV. 
A REVISION OF THE GENUS VIGUIERA. 
By S. F. Buake. 
I. History 
THE genus Viguiera of the helianthoid Compositae, named in 
honor of L. G. A. Viguier, a physician of Montpellier and author 
of a monograph of Papaver, was established by Kunth ' in 1820 on 
the single species V. helianthoides of Cuba, and was distinguished 
from Helianthus by its conic receptacle, “ simple involucre,” and 
pappus of two awns with several intermediate squamellae. Its af- 
finities with Spilanthes, with which it was also compared by its 
author, are too remote to require notice in this connection. Two 
years later Cassini ? proposed to establish under the name Leighia 
a new “sous-genre . . . dans le genre Helianthus,” to include the 
three species now known as Viguiera linearis (Cav.) Sch. Bip., 
Helianthus angustifolius L., and H. microphyllus HBK., only the 
first of which was autoptically known to him, and must conse- 
quently stand as the type of the name. At the same time he added * 
to his “ sous-genre ” Harpalium, founded ‘ in 1818 on H. rigidum, 
the species Harpalium truzillense (Helianthus truzillensis HBK.) 
and H. aureum (Helianthus aureus HBK.). In his article on Leighia 
Cassini incidentally drew attention to the character now generally 
considered critical in the separation of Viguiera and Helianthus — 
the persistent pappus of the former, always with squamellae be- 
tween the awns, and the deciduous pappus of the latter, with squa- 
mellae none or rarely present and few. 
DeCandolle § in 1836 recognized the three genera, although sug- 
gesting that they might require union: ‘“ Forte Viguiera, Leighia, 

1 HBK. Nov. Gen. iv. 224. t. 379 es 
2 es Dict. Sci. Nat. xxv. 435 (1822). 
Cass. 1. ¢. 438 (1822 
. ‘oe . Bull. ag Philom. 1818. 141 (1818). 
5 DC. Prod. v. 578-583 (1836). 
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