Pipei — Andropogon halepensis and Andropogon sorghum. 35 



Entebbe, Uganda, alt. 4000 ft., Mahon (?) in 1902 (Kew). Panicle 



loose and open; spikelets 7-8 mm. mostly fallen; awns 17 mm. Tip of 



pedicels glabrous. Probably distinct from vogelianus. 

 Below Mazzaro, Zambesi River, Dr. J. Kirk, March 31, 1860 (Kew). 



"Grows in damp places 4-8 feet high. Fruit eaten by the people in 



times of famine." Spikelets 7 mm. long; awns 12-17 mm. long. Panicle 



pyramidal and open. Agrees well with the Entebbe specimen. 



Kibwezi, German East Africa, G. R. 0. Schaffler No. 498, June 5, 



1910, 1000 ft. alt. (Berlin). Spikelets 6-8 mm. long. Awns 20-22 mm. 



long. 



Andropogon sorghum effusus Hackel. 



Andropogon artmdinaceus Willd.: L. Sp. PI. Ed. 4. 4:906. 1805. Not 

 Scopoli, 1772. Based on a plant collected by Isert in Guinea. 



Rhaphis arundinacea Desv. Opuscula 69. 1831. Different generic reference 

 for Andropogon arundinaceus Willd. 



Andropogon sorghum effusus Hackel in DC. Monogr. Phan. 6:503. 1889. 

 In Hackel's conception, Andropogon sorghum effusus is based on the 

 combined characters of two subvarieties, namely, subvariety aristaius 

 with the awn 7-9 mm. long for which are cited the following synonyms : 

 Andropogon arundinaceus Willd. ; Rhaphis arundinacea Desv. ; Tracy - 

 pogon avenaceus Nees ; and Sorghum halepense Nees Fl. Afr. Austr. p. 88 ; 

 and subvariety submuticus with the awn barely protruding, to which 

 is referred Holcus decolorans Willd. {Andropogon decolorans H BK.). 

 Hackel's citations of specimens bear no relation to the types of the 

 above names, the first specimen cited being SchweinfurW s No. 1521 

 from Matamma, Gallabat, which specimen Hackel mentions on the 

 following page as ambiguous between effusus and aethiopicus. The 

 references to Holcus decolorans Willd. and Tr achy pogon avenaceus 

 Nees are to plants described from American specimens. 



Holcus decolorans Willd.: L. Sp. PI, Ed. 4. 4:931. 1805. Specimens 

 from "America meridionali." apparently those from which Andropogon 

 decolorans H B K. was later described. 



Andropogon decolorans H B K. Nov. Gen. 1:190. 1815. Based on spec- 

 imens collected between Cumana and Bordones, Venezuela. As Willd- 

 enow's description of Holcus decolorans is cited, that is evidently based 

 on the same collections. The plant is indicated to be perennial. 



Sorghum decolorans R. & S. Syst. Veg. 2:838. 1817. New generic 

 reference for the above. 



Andropogon avenaceus H B K. Nov. Gen. 1:189. 1815. Described from 

 specimens collected at Havana and Regla, Cuba. The citation by 

 H B K. of the name Andropogon avenaceus Schrad. is an error as at 

 the place cited Schrader describes only ^ndropoyon arundinaceus Scop. 



Trachypogon avenaceus Nees in Martins FI. Bras. 2:354. 1829. Different 

 generic reference for Andropogon avenaceus H B K. 



There is reason to doubt Hackel's reference of Holcus decolorans Willd. 

 to effusus as all the specimens in the U. S. National Herbarium from 

 Cuba, including some from the vicinity of Havana, are Andropogon 



