. 
Jes a 
Belts Bin ie: 
ope 
36 TRIANDRIA. MONOGYNIA. 
been considered a Scirpus (Michaux), by many a Cyperus 
(Willdenow), and Vahl has decribed it as a Schenus, it 
certainly approaches the genus Cyperus, but is distin- 
guished from it by the présence of the germinal fila- 
ments, and its subulate glumes. In habit it very widely 
recedes from Scirpus and Schanus,and all the glumes, be- 
sides their very peculiar form and mode of aggregation, 
are uniformly fertile. 
Species. 1. D. spathaceum. 2. Canadense, (This genus 
is peculiar to the United States.) 
54, TRICHOPHORUM. Persoon. 
gir eed ovate; Calix scales imbri- 
- . cated on all sides. Corolla ©. Germinal sete 
(invelucellum) capillary, mostly 6, in the ripen- : 
ing seed, growing out very long. | 
Culm triquetrous, leafy, terminated by a paniculate 
umbell; or naked, with a single spike; involucellum of the 
seed capillary and definitely parted, (sete about 6) not 
woolly and indefinite as in Eriophorum, to which genus 
the 7. alpinum and T. Hudsenianum have hitherto been 
referred. The 7. cyperinum has a very near affinity to 
the genus Scirpus, where it was placed by Michaux, and 
from its great dissimilarity of habit with the Eriophorum 
alpinum, now referred to Trichophorum by weare 
“obliged to consider the present iat Gory atlieary 
and artificial. All the species of Trichophorum, naturally 
belong to the genus Scirpus, and there is no line of sepa- 
ration, except we are to consider the elongation of the se- 
ninal filaments or involucellum,as a peta eer suf- 
ficient to constitute a genus; for the number of the seta, 
6, so carefully inserted in the generic character, is the 
. prevailing number in the genus Scirpus. (Mr. Pursh adds 
- setis 6-9.) 
|, SPectes. 1. T. cyperinum. 2. Hudsonianum, (nearly al- 
