12 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



ing a 3-valved calyx and lacking awns and involucre. But it is 

 clear from the note that Linnaeus here also referred to the genus 

 Panicum those species inVhich the spikelet is awned and those with 

 an involucre. It is true he refers to the corolla valves as being awned, 

 but this is apparently an error, and originated from a misinterpreta- 

 tion of Scheuchzer's figure a of Echinocliloa crusgalli. 



As stated above the genus Milium, as described in the first edition 

 of LinnaBus's Genera Plantarum, is based on the species now called 

 Panicum miliaceum L. and is taken directly from Tournefort's work. 

 The calyx is described as 3-valved. In the next three editions of the 

 Genera Plantarum, Linnaeus still cites Tournefort as the author of 

 Milium and refers to his plate 298, but he changes the diagnosis to 

 read, calyx 2-valved, and adds the note that Milium with a 2-valved 

 calyx differs from Panicum with a 3-valved calyx. The genus 

 appears in the fifth and sixth editions as in the preceding three edi- 

 tions, except that the last-mentioned note is omitted. 



The treatment of the two genera in the Species Plantarum b is 

 in accord with that in the fifth edition of the Genera Plantarum. 

 Under Panicum twenty species are described, divided into two 

 groups, Spicata and Paniculata. The species are as follows: 



1. P. alopecuroid[es]=Pennisetum caffrum (Bory) Leeke. 



Munro c states that the specimen in the Linnaean Herbarium is 

 Gymnoihrix thouarii Beauv., which species is referred by Leeke d as 

 above. This is a different species from Pennisetum alopecuroides 

 Desv. g or Pennisetum alopecuroides Spreng./ which is based on Cen- 

 clirus alopecuroides Thunb. 



2. P. glaucum = Chaetochloa glauca (L.) Scribn. 

 P. glaucum' (3 = Chaetochloa viridis (L.) Scribn. 

 P. glaucum-f —Chaetochloa glauca (L.) Scribn. 



3. P. americanum= Pennisetum americanum (L.) Schum. 



4. P. italicum = Chaetochloa italica (L.) Scribn. 



5. P. crusgalli =Echinochloa crusgalli (L.) Beauv. 



P. crusgalli /? =Echinochloa crusgalli (L.) Beauv. The long-awned form. 



6. P. dissectum =Paspalum dissectum L. 



7. P. dimidiatum =Stenotaphrum dimidiatum (L.) Brongn. 



8. P. sanguinale =Syntherisma sanguinalis (L.) Dulac. 



9. P.filiforme =Syntherisma filiformis (L.) Nash. 

 10. P. compositum=Oplismenus compositus (L.) Beauv. 



aAgrost. pi. 2.f. 2. P. 1719. 

 &L. Sp. PI. 55. 1753. 

 cProc. Linn. Soc. Bot. 6: 37. 1862. 

 dZeitschr. Naturwiss. 79: 39. 1907. 

 eHamilt. Prodr. PI. Ind. Occ. 11. 1825. 

 /Syst. Veg. 1: 303. 1825. 



9 For a further discussion of the Linnaean species based upon American plants, see 

 Hitchcock, Contr. Nat. Herb. 12: 114. 1908. 



