120 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Agrostis indica L. Sp. PI. 63. 1753. 



The type specimen from "Br," is Sporobolus indicus (L.) R. Br. Linnseuso cites as 

 a synonym, Sloane, Hist. Jam. 1: 115. pi. 73. f. 1. This also is Sporobolus indicus. 

 Linnseus cites the same plate under Poa ciliaris. b 



Agrostis radiata L. Syst. Nat. ed. 10. 2: 872. 1759. 



The specimen in the Linnsean herbarium from "Br" is Chloris radiata (L.) Sw. as 

 described in Grisebach's Flora. Chloris radiata (L.) Sw. Prod. 26. 1788, is based on 

 Agrostis radiata L. Swartz's specimen is also this species. After his own description 

 in the Systema Linnseus cites Sloane 's plate 68, figure 3, but does not use his diagnosis, 

 hence the Linnaean plant is the type. Sloane's plant is Chloris elcusinoidcs Griseb. 



Agrostis cruciata L. Syst. Nat. ed. 10. 2: 872. 1759. 



The specimen is from "Br." Linnaeus cites Sloane's plate 69, figure 1 after his own 

 description, but does not use his diagnosis, hence Browne's plant in the Linnsean her- 

 barium is the type. This and Sloane's plant are Chloris cruciata (L.) Sw., as generally 

 understood. 



Aira spicata L. Sp. PI. 64. 1753. 



All the species of Aira of Linnseus are based upon Old World material. Linnaeus 

 inadvertently gave the specific name spicata to two species of Aira in the same publi- 

 cation. The first is on page 63. He discovered this error and in the errata, volume 2, 

 changed the name of the first to indica. In the tenth edition of the Systema Naturae 

 he described the first species under the name A.'indica and the second he changed to 

 .1. subspicata, thus eliminating the name spicata altogether. In the Species Plan- 

 tarum, ed. 2, 1762, the name spicata is retained for the second,' probably inadvertently. 

 The two specimens in the herbarium show evidence of these changes. The first sheet, 

 which is Panicum indicum, shows the word Aira with a line drawn through, Panicum 

 written in front, and the final "a" of the specific name changed to "um." The 

 second sheet, which is Trisetum subspicatum (L.) Beauv., shows that "sub" has been 

 later prefixed to "spicata." The specimen of this is pubescent like Avena mollis 

 Michx. I 'I'risi turn molle (Michx.) Kunth.) Some authors have restricted the Linnaean 

 name to the glabrous form and used Michaux's name for the pubescent form, either as 

 a species or a subspecies. It the two forms are considered distinct, the glabrous form 

 must receive a different name. 



As Linnaeus corrected the name of the first Aira spicata to Aira indica in his list of 

 errata, the latter name is valid for that species. The second Aira spicata is also valid 

 and the name of the species is Trisetum spicatum (L.) Richter, Plant. Europ. 1: 59. 

 1890(7'. subspicatum (L.) Beauv.; T. molle (Michx.) Kunth.) 



Aira aquatica L. Sp. PI. (i-4. 1753 (Catabrosa aquatica (L.) Beauv.), A. cacspitosa L. 

 loc. cit. (Deschdmpsia caespitosa (L.) Beauv.), and A. flexuosa L. op. cit. 65 (Des- 

 champsia flexuosa (L.) Trin.) appear to be identical with our North American forms. 



Poa flava L. Sp. PI. 68. 1753. 



Based on "Gron. virg. 13." Gronovius's specimen, Clayton no. 273, which is the 

 type, is Triodia cuprea Jacq. c I do not consider this species congeneric with Triodia 

 R. Br. Beauvois based his genus Tricuspis upon this species, changing d Poa cacru- 

 lescens Michx. (a herbarium name for this species) to Tricuspis carolinidna. But on 

 account of Tricuspis Pers. 1807, Roemer and Schultes changed the name of the genus 

 to Tridens, citing Beauvois's figure. The type species is Tridens quinquifida (Poa 

 quinquifida Pursh, which is the same as Poa flava L.). Hence the name becomes 

 Tridens flava I L.) Hitchc. Rhodora 8: 210. 1906. 



« Sp. PL 63. 1753 and ed. 2. 94. 1762. c Of. Bot. Gaz. 38: 297. 1904. 



b Sp. PI. ed. 2. 102. 1762. d Agrost. 77. pi. 15. f. 10. 1812. 



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