OF ARTS AND SCIEXCES : OCTOBER 14, 1862. 77 



4. Revision of the North American Species of the Genus 

 Calamagrostis, Sect. Deyeuxia. By Asa Gray. 



The species of Calamagrostis which possess the rudiment of a sec- 

 ond flower {Deyeuxia, Kunth.), that have as yet been detected in 

 Eastern North America, I can discriminate as follows : — 



* Panicle loose and open even after floivering, and the {mostly purple- 

 tinged or lead-colored) strigose scabrous glumes not closing in fruit : 

 hairs of the base of the flower about as long as the hyaline lower 

 palea or sometimes a little shorter, not surpassed by those of the ru- 

 diment ; awn slender, straight, about equalling the palea. Leaves 

 flat ; culm tall. 



1. C. Canadensis, Beauv. Glumes ovate-lanceolate, acuminate, 

 barely a line and a half long ; awn very delicate, not exceeding the 

 hairs of the flower. — Subarctic America (from Bear Lake) and 

 throughout Canada to Pennsylvania and New Mexico above Santa Fe 

 (Fendler, 957). 



2. C. Langsdorffii, Trin. Glumes lanceolate or oblong-lanceolate, 

 attenuate-acuminate, 2^ to 3 lines long, often cinereously strigose-sca- 

 brous; awn stouter and often slightly exceeding the palea. — Labrador 

 and Newfoundland to Behring Straits, Sitcha ( G. strigosa, Bongard), and 

 south to the White Mountains of New Hampshire in the alpine region 

 (W. Boott), Santa Fe, New Mexico (Fendler, 969), and Oregon (Tol- 

 mie, Nuttall, C. Columbiensis, Nutt. in herb., &c.). Also Greenland 

 ( Wormskiold, fide spec, ex herb. Lehmann.) ; Scandinavia ( C. elata, 

 Blytt. G. phragmitoides, var. elata, Anderss., — and it has the aspect 

 of the last-named species, but the rudiment is manifest) ; Russia ; and 

 Siberia (C. purpurea, Trin., &c.). C. hirtigluma, Steud., is certainly 

 this species, but not Arundo Grcenlandica, Schrank. C Langsdorffii 

 has been much confounded with C. strigosa, perhaps even by Wahlen- 

 berg himself; whose Arundo strigosa would seem from the original 

 figure and description to be the C. strigosa of Hartmann ( C. Hariman- 

 niana. Fries), while all recent Scandinavian authors take it to be 

 another, closely related, strict-panicled species, and from Wormskiold's 

 herbarium we have the open-panicled and long-haired C. Langsdorffii 

 under this name. The latter may be what Wahlenberg communi- 

 cated to Bongard. At least, spikelets received by me from herb. 

 Hook., as " C. strigosa, Sitcha " (whether from Bongard is not stated), 

 belong to C. Langsdorffii. 



9* 



