138 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
further states that it is called in Jamaica Dutchgrass and is indigenous in Surinam. 
Swartz probably thought his specimen to be the same as Browne’s plant, and, while he 
described his own specimen, his description was modified by his knowledge of the 
habit of the other species. Under these circumstances I think we should consider the 
specimen in Swartz’s herbarium as the type of Panicum molle, which name should be 
taken up for Panicum velutinosum Nees. A specimen in the Munich herbarium 
labeled P. molle from Jamaica, sent by Swartz, is Panicum sloanei Griseb. or some 
closely allied species. Iam not yet prepared to say whether or not Panicum numi- 
dianum Lam. (1791) of Africa is the same as Panicum barbinode Trin. (1835) of Brazil. 
They are made synonymous in Martius’s Flora Brasiliensis. In the type of P. numi- 
dianum the spikes are rather loosely flowered, the rachis lacks bristles, and the lower 
glume is half as long as the spikelet. According to Hooker,@ this should be Panicum 
muticum Forsk. 
Panicum fasciculatum Sw. Prod. 22. 1788. 
There are two forms upon the sheet, which is labeled ‘Jamaica, Swartz. P. fasci- 
culatum. fl. ind. occ.’ The chief specimen (which I accept as the type) is a good 
match for Maxon no. 1659, collected in Jamaica in 1903. The spike-like racemes are 
slender and 6 to 8 cm. long, the axis and pedicels pilose with scattered long, white 
hairs. The spikelets are 2 mm. long, strongly reticulated, glabrous, rather dark 
brown in color. The right-hand specimen, also P. fasciculatum, has a more compact 
panicle, with shorter spikes and spikelets about 2.5 mm. long. 
Panicum chartaginense Sw. Prod. 22. 1788, 
The specimen is marked ‘Panicum chartaginense Fl. Ind. Occ. Swartz.’’ It is 
the same as to floral character as the right-hand specimen of P. fascieulatwm men- 
tioned above, and has compact panicles with spikes about 2 em. long. The habit of 
the plant is somewhat different. The culms are more or less prostrate-spreading, 
the leaves short and crowded and more or less pubescent, especially the sheaths: 
the panicles are somewhat included at the base; the spikelets are 2.5 mm. long. The 
general appearance is that of Panicum reticulatum Torr. of Mexico. This form can be 
recognized as a subspecies under the name of Panicum fasciculatum chartaginense 
(Sw.) Doell.6 (Panicum chortaginense Sw.; P. reticulatum Torr.) 
Panicum nemorosum Sw. Prod. 22. 1788. 
Tlie type specimen is marked by Swartz with the name and “fl, ind. oce.”’ It is 
Ichnanthus nemorosus (Sw.) Doell. 
Panicum acuminatum Sw. Prod. 23. 1788. 
The type sheet is marked by Swartz “2. acuminatum fl. ind. occ, Jamaica. 
Swartz.’’ The plants are all the autumnal state. This has recently been described 
as Panicum comophyllum Nash, Bull. Torr. Club 80: 380. 1903. 
Panicum rigens Sw. Prod. 23. 1788. 
The type specimen is marked ‘‘P. rigens fl. ind. occ. Jamaica. Swartz.’’? It is an 
Isachne, and is the same as that described by Grisebach in his Flora of the British 
West Indies under the name of J. rigens Trin. Grisebach’s plant collected by Mac- 
fadyen in Jamaica, preserved in the herbarium of Grisebach at Gottingen, is the same. 
Isachne rigens Trin. is based upon Panicum rigens Sw. and the name of our plant is 
Isachne rigens (Sw.) Trin. Gram. Pan. 252. 1826, although the plant described here 
and in Martius’s Flora Brasiliensis appears to be Jsachne rigidifolia (Poir.) Urb. ( Ag- 
rostis rigidifolia Poir. The type specimen of Agrostis vigidifolia Poir. was examined in 
the herbarium at Florence. It has distichous, glabrous leaves, and rigid, spreading, 
panicle branches quite different from those of Panicum rigens Sw. Sieber no. 265 from 
Martinique is /. rigidifolia and is cited by Grisebach, indicating that he confused the 
two species. Some of the plants sent by Swartz to other herbaria under the name of 
a Fl. Brit. Ind. 7: 34. 1896, bIn Mart. Fl. Bras. 27: 205. 1877. 
