REVISION OF THE GENUS FLOURENSIA. 
By 8. F. BLaKe. 
INTRODUCTION. 
The genus Flourensia, established by De Candolle' in 1836 to 
include a Chilean plant described by Molina as a Helianthus and three 
new species, was divided by him into two groups—one, Chilean, 
including the two radiate species F. thurifera (Mol.) DC., with a 
variety angustifolia DC., and F. corymbosa (a true Viguiera); the 
other, Mexican, with the two discoid species F. laurifolia and F. 
cernua, both based on Berlandier’s collections. In the Genera Plan- 
tarum of Bentham and Hooker? Flourensia was included under Helian- 
thus with some mention of its peculiarities, while F. corymbosa was 
relegated to Viguiera. In 1883 Gray ® discussed the genus, consid- 
ering the discoid species typical, suggesting that F. thurifera might be 
included as a section “under Bertero & Colla’s name (not Cassini’s) 
of Diomedea’”’ * and giving the new name Viguiera poeppigu to F. 
corymbosa. The genus was again referred to Helianthus by Baillon ° 
in 1886, but was recognized as distinct by Hoffman® in 1890, and 
has been retained by all subsequent authors. 
In 1870 Philippi’ described F. hispida from Chile, and in the next 
decade Griesbach published three radiate species, truly referable to 
the genus, from Argentina. Philippi’s species, however, repre- 
sented in the Berlin Herbarium by an authentic but very poor speci- 
men, is a Viguiera apparently identical with V. gilliests (Hook. & 
Arn.) Hieron. 
In 1891 Philippi® published Helianthus atacamensis, referred to 
Flourensia by Reiche® in 1905, and in 1895? several new species 
1 Prodr. 5: 592. 1836. 
2 Gen. Pl. 2: 376. 1873. 
3 Proc. Amer. Acad. 19: 7. 1883. 
4 Bertero’s reference of Helianthus thurifer to Diomedea Cass. (Borrichia) surely does 
not justify the citation of a genus ‘‘Diomedea Bert. non Cass.”’, as given in all our 
systematic works. 
5 Hist. Pl. 8: 46. 1886. 
6 In Engl. & Prantl, Pflanzenfam. 4°: 237. 1890. 
7 Anal. Univ. Chile 36: 186. 1870. 
8 Verz. Antofag. Tarapac. Pfl. 48. 1891. 
® Fl. Chil. 4: 94-95. 1905. 
10 Anal. Univ. Chile 90: 36-40. 1895. 
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