WEST INDIAN GRASSES DESCRIBED BY SWARTZ. 139 



Panicum rigens are not the same as the plant in his own herbarium. The specimen at 

 Florence is /. rigidifolia. The specimen from the general herbarium at Stockholm, 

 which was seen by me at Halle, is Panicum acuminatum Sw. The specimen at Berlin 

 I think is the same as the original at Stockholm, though it has longer leaves, the blades 

 being 6 cm. or more long; but, as in the case of the other, the surface of the blades is 

 scabrous to the touch as described by Swartz. There are some points in Swartz's 

 description which lead one to think that he had seen Isachne rigidifolia. He says, 

 in the more extended description in his Flora," "Gramen rigiditate peculiare." But 

 in the original diagnosis in the Prodromus he states that the leaves are scabrous, 

 which applies to his specimen, but not to Isachne rigidifolia. Swartz's type at 

 Stockholm is well matched by Fendler no. 1637 from Venezuela (U. S. National 

 Herbarium no. 822538). 



Panicum fuscum Sw. Prod. 23. 1788. 



The type specimen is marked " P. fuscum Flor. ind. occ. Jamaica, Swartz." The 

 panicles are small and compact like those of P. chartaginense Sw., and the spikelets 

 are like those of P. fasciculatum Sw., but slightly larger. A good match for this is 

 Maxon no. 2361 from Jamaica. It should be considered a synonym of P. fascicu- 

 latum. 



Panicum laxum Sw. Prod. 23. 1788. 



The type specimen is marked 'P. laxum fl. ind. occ. Jamaica. Swartz." It belongs 

 to this species as usually described. Synonyms are: P. agrostidiforme Lam. 1791, type 

 at Paris marked ''lam. ill. gen. ex D. Richard;" P. tenuiculmum Meyer, 1818, portion 

 of type in the herbarium of Trinius at St. Petersburg marked "Prim. Fl. Esseq.," 

 sent by Meyer; P. diandrum Kunth, 1829, type in the Berlin herbarium, collected 

 in Guadaloupe by Balbis (the second specimen cited by Kunth, Rio Janeiro, col- 

 lected by Gaudichaud, is also in the Berlin herbarium); P. ramuliflorum Hochst. 

 in Steudel, Syn. PI. Glum. 1854, type in the herbarium of Steudel at Paris. This 

 last specimen is also marked Agrostis nigrescens Salzm. and is from Bahia. Steudel's 

 cited specimen, Kappler PI. Surin. no. 1523 is the same species (fide specimens seen 

 in various herbaria, such as those of Munich and Leipzig). 



Panicum flavescens Sw. Prod. 23. 1788. 



The type specimen is marked "P. flavescens fl. ind. occ. Jamaica. Swartz." It is 

 the same as P. fasciculatum. The panicle is somewhat more open, but the branches 

 of the panicle are slender, about 8 cm. long, resembling in this respect the specimen 

 of P. fasciculatum rather than that of P. fuscum, but nearly devoid of bristles. The 

 spikelets are brownish, strongly reticulated, slightly exceeding 2 mm. in length. 

 Panicum flavescens as described by Grisebach& and by Hooker c is very different, 

 being a species of the section Ptychophyllum. 



Panicum diffusum Sw. Prod. 23. 1788. 



The type specimen is labeled ''diffusum fl. ind. occ," and belongs to that species 

 as generally understood. 



Panicum oryzoides Sw. Prod. 23. 1788. 



The type specimen labeled "P. oryzoides fl. ind. occ. Jamaica. Swartz." is the same 

 as P. zizanioides H. B. K. (1815), which name must be used on account of Panicum 

 oryzoides Ard. Animad. Spec. Alt. 16. 1764. 



Panicum pallens Sw. Prod. 23. 1788. 



The type specimen marked "P. pallens fl. ind. occ." is Ichnanthus pallens (Sw.) 

 Munro. 



<*FL Ind. Occ. 1: 154. 1797. e Fl. Brit. Ind. 7: 56. 1896. 



&F1. Brit. W. Ind. 547. 1864. 

 35023— vol 12, pt 3— OS 3 



