138 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



further states that it is called in Jamaica Dutchgrass and is indigenous in Surinam. 

 Swart z 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. I am 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, a this should be Panicum 

 muticum Forsk. 



Panicum fasciculatum Sw. Prod. 22. 1788. 



There arc two forms upon the sheet, which is labeled "Jamaica, Swartz. P. fasci- 

 culatum. ft. 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. fasciculatum men- 

 tinned above, and has compact panicles with spikes about 2 cm. 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. & (Panicum chartaginense Sw.; P. reticulatum Ton.) 



Panicum nemorosum Sw. Prod. 22. 1788. 



The type specimen is marked by Swartz with the name and "fl. ind. occ." It is 

 Ichnanthus nemorosus (Sw.) Doell. 



Panicum acuminatum Sw. Prod. 23. 1788. 



The type sheet is marked by Swartz "P. acuminatum fl. ind. occ. Jamaica. 

 Swartz." The plants are all the autumnal state. This has recently been described 

 as Panicum comofhyllum Nash, Bull. Torr. Club 30: 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 I. rigens Trin. Grisebach 's plant collected by Mac- 

 fad yen in Jamaica, preserved in the herbarium of Grisebach at Gottingen, is the same. 

 Tsachne 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 Isachne rigidifolia (Poir.) Urb. (Ag- 

 rostis rigidifolia Poir. The type specimen of Agrostis ligidifolia Poir. was examined in 

 the herbarium at Florence. It has distichous, glabrous leaves, and rigid, spreading, 

 panicle branches quite different from those of Panicumrigens 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. b In Mart. Fl. Bras. 2 2 : 205. 1877. 



