198 CONTRIBUTIONS l-'lto.M THE NATIONAL HERBARIUM. 



22. Chaetochloa setosa (Swartz) Scribn. 



Panicum setosum Swartz, Prodr. Veg. Ind. Occ. 22. 1788. "Jamaica." The type 

 specimen in the Swartz Herbarium at Stockholm, has a narrow, rather close pani< :le. 



Panicum caudatum Lam. Tabl. EncycK 1: 171. 1701. "E Brasilio. Comma's. & 

 Cayenna. D. Richard." The species is more fully described in the Encyclopedia. 1 

 It is said here, concerning the locality, "Cette espece croit a Cayenne, & m'a <'i<- 

 communiquee par le citoyen Richard. Comerson l'a trouvee au Bresil. Elle y forme 

 une variete a grappe tres-grele, a peine barbue sur le rachis. " The Richard specimen, 

 in the Lamarck Herbarium at Paris, taken as the type, is a culm with several leaves 

 and apamcle 20 cm. long, the lower branches 2 cm. long. It is labeled "ex D. Rich- 

 ard" and comes from Cayenne. The identification of this specimen is somewhat un- 

 certain. It resembles specimens of Chaetochloa setosa from the 'West Indies, rather 

 than the specimens from Brazil that have been referred to C. caudata and which in this 

 paper are placed under C. rari flora. As noted above, Lamarck states that his Brazilian 

 specimen has a more slender panicle and is less bristly. In the National Herbarium 

 there are no specimens of C. setosa from southeast of Trinidad. There may be an error 

 as to the origin of Richard's specimen, said to come from Cayenne. It may have 

 come from the West Indies. 



Setaria setosa Beauv. Ess. Agrost. 51, 178. 1812. Based on Panicum setosum Swartz. 



Panicum brachiatum Poir. in Lam. Encycl. Suppl. 4: 282. 1816. "Cette plante croit 

 aux Antilles (V. s. in herb. Desfont.)." The type specimen, in the Desfontaines 

 Herbarium at Florence, consists of a panicle and a fragment of a culm bearing a single 

 leaf. The specimen is similar to Chase 6519, from Ensenada, Guanica Bay, Porto 

 Rico, bearing the note "plant woody, main culm erect, branches divaricate, arid 

 cleared limestone hillside." The plant is decumbent, sending up erect branches. 

 The panicles are very open, bearing spreading or reflexed, distant branches, the lower 

 as much as 4 cm. long. This specimen agrees with the type in having the axis of the 

 panicle scabrous but not villous. Hitchcock's no. 9315, from dry woods along the 

 coast east of Kingston, Jamaica, agrees with this in habit and shape of the panicle, but 

 the axis is villous, as is usual in C. setosa. It was noted in both cases that other speci- 

 mens in the vicinity showed gradations to the usual form of C. setosa. The open- 

 panicled form, like the type of Panicum brachiatum. is found here and there, on dry 

 brushy hillsides, but always associated with the more usual form. It is discussed 

 further at the end of the description of Chaetochloa setosa. 



Setaria caudata Roem. & Schult. Syst. Veg. 2: 495. 1817. Based on Panicum can- 

 datum Lam. 



Setaria elongata Spreng.; Schult. Mant. 2: 280.1824. "In S. Domingo." Sehultes 

 states, "Setaria elongata Spreng. in litt. ad D. Balbis in Herb. Berteron." In the 

 Berlin Herbarium is a specimen labeled "Hb. Sprengel. S. Domingo. Bertero lgt. 

 Balbis ad Spr." (Herbarium Krug et Urban). This specimen, the type, is a some- 

 what open-panicled, short-bristled form of Chaetochloa setosa, intermediate between 

 Panicum brachiatum, mentioned above, and the usual form of Chaetochloa setosa. 



Setaria brachiata Kunth, Rev. Gram. 1: 47. 1829. Based on Panicum brachiatum 

 Poir. 



Panicum puractaenoides Trin. Mem. Acad. St. Petersb. VI. Sci. Nat. 1: 219. 1834. 

 " V. sp. e Krabbeneiland." The type specimen, collected in Crab Island (now called 

 Vieques, near Porto Rico) by Hornemann, is in the Trinius Herbarium. It is a loose- 

 panicled form much like the type of Setaria elongata, mentioned above, and similar to 

 Britton & Wheeler 233, from Culebra. 



Panicum dumetorum A. Rich. ; Steud. Syn. PI. Glum. 1 : 49. 1S54. " Ins. Aniillae.'' 

 The type specimen, from St. Croix, is the open-panicled form like ibe types of Setaria 

 elongata and Panicum paractaenoides . 



Panicum restitutum Steud. Syn. PI. Glum. 1: 53. 1854. Based on Setaria elongata 

 Spreng. (not Panicum elongatum Pursh, described by Steudel on page 71). 



1 Lam. Encycl. 4: 736. 1798. 



