Chase — Notes on Genera of Panicetz. IV. 



115 



Panicum thrasyoides in. ul 



Fig. 1 . 



Th rasya thrasyoides. 



(Two views of spikelet and fruit x 10 



diam.) 



UDique in carnpis siccis, Brasiliae erescens, leg. 

 incuse Dec. 1824. el. Langadorff." 



Thrasya hirsuta Nees, Agrost. Bras. 

 !)4. 1829. Based on P. thrasyoides 

 Trin. Nees distinguishes between this 

 and T. paspaloides, a specimen of the 

 original collection of which he exam- 

 ined in the Willdenow Herbarium. 

 We take it on his authority that the 

 two are distinct. So far as we know 

 they have not been united, but they 

 are closely allied and it seemed possi- 

 ble that Kunth's erroneous description 

 might have led to failure to recognize 

 his species. 



Thrasya petrosa (Trin.). 



Panicum petrosum Trin. Gram. Icon. 3: pi. 280. 1836. Trinius states 

 that the illustration is "ad specimen Brasilianum." The type specimen, 

 in the Trinius Herbarium, labeled "Panicum petrosum m. Cuyaba 

 febr. 1827," was probably collected by Langsdorff. 



Tylothrasya petrosa Doell, in Mart. Fl. Bras. 2: z 295. pi. 37. 1877. 

 Based on Panicum petrosum Trin. Doell bases his genus Tylothrasya on 

 this species, the basal callus being the character by which he differentiates 

 it from Thrasya H. B. K. Thrasya thrasyoides, however, has this callus 

 though it is less pronounced than in T. petrosa. Bentham (Linn. Soc. 

 Journ. Bot. 1!» : 42. 1881) misspells the specific name "petraeum." 



Thrasya cultrata (Trin.) Nees, Agrost. Bras. 94. 1821). 



Panicum cultratum Trin. Gram. Pan. 126. 1826. " Brasil (Langs- 

 dorff)." The type specimen, in the Trinius Herbarium, is labeled 

 "Panicum cultratum m. In graminosis, m. da Congonhas, Brasil. leg. 

 mense Jan. 1825. cl. de Langsdorff. Thrasya cultrata N. ab Esenb." 

 Above this the name " cultratum " had been written and crossed out, 

 apparently by Trinius himself, and " monostachyum Hb. Kth." added. 

 In his later work, " Panicearum Genera" (Mem. Acad. St. Petersb. VI. 

 Sci. Nat, 3 : 2 228. 1834) Trinius gives P. cultratum as a synonym of P. 

 monostachyum. 



Thrasya campylostachya (Hack.). 



Panicum ca mpylostachyum Hack. Oesterr. Bot. Zeitschr. 51 : 367. 1901. 

 " Costarica ; in savannis ad Canas Gordas leg. Pittier, nr. 11012 et 11018." 

 The type (no. 11012) is in Hackel's herbarium, a duplicate is in the 

 National Herbarium. 



This and the preceding species differ from the first three here listed in 

 the lack of the quill-like hairs on the halves of the split sterile lemma, 

 and also on the summit of the fruit. 



