PRrehe ek AR LICLES. 
NOTES ON NORTH AMERICAN GRASSES. V. 
SOME TRINIUS PANICUM TYPES. 
BELOw are given a few notes upon certain species of Panicum described 
by Trinius from American material. The herbarium of Trrntus, the 
father of modern agrostology, is deposited in the St. Petersburg Academy 
of Sciences. The curator of the herbarium, Dr. D. I. Lrrwrnow, very 
kindly sent, for deposit in the National Herbarium, portions of the speci- 
mens of the species mentioned in this article. It will be observed that 
three of the seven species had been described by earlier authors, while four 
have been recently described as new species. It must be said, however, 
that it would be impossible to identify any of these four species from the 
description alone. This is true of many of the earlier descriptions of the 
group Dichotoma of the genus Panicum, and on account of the difficulty 
of consulting the types of these species, it is in a measure excusable, on the 
ground of convenience, to describe unidentified species as new, without 
determining the application of the older names. Such painstaking and 
laborious comparison should not, however, be shirked by a monographer. 
P. CHAMAELONCHE Trin. 1826, Gram. Pan. 242. 
are et minus. Panicula (semipollicari) lucidissima; Spiculis pusillis, 
obovato-oblongis, obtusiusculis, glabris; pedicellis hispidulis; Gluma inferiore 
flosculis triplo breviori 1-, superiore eosdem aequante 5-nervi; Hermaphrodito 
elliptico, mucronulato, laevi, neutrum aequante. 
V. spp. Am. bor. (TRATTINICK, ex. coll. Enslini). 
Plantula caespitosa, stricta, culmo tenuissimo, ramuloso. Folia lanceolata 
1. lineari-lanceolata, strictiuscula, semipollicaria, glabra; culmea et juniora 
subinvoluta, acicularia, breviora. Panicula pauciflora, tenera, prodit e summa 
vagina elongata, cujus folium eandem fere aequat. Flosculus neuter univalvis ? 
Hermaphroditus albescens. 
Label accompanying type specimen: ‘‘In Am. bor. s. dat. sine nom. 
ex. hb’° Enslini cl. Trattinick.” 
Specimen =P. Baldwinii Nutt. 1898. Scribn. Div. Agros. Bull. 11:43- 
P. pemissuM Trin. Spec. Gram. 3:319. oe 
The type specimen is from Rio Janeiro. I have not seen this species 
from North America. It is mentioned here because the name occurs 
occasionally in the literature of North American grasses, and has been 
doubtfully applied to certain of our species. 
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