Ptilagrostiella kingii (Bol.) Romasch., comb. nov.

Peterson, Paul M., Romaschenko, Konstantin, Soreng, Robert J. & Reyna, Jesus Valdes, 2019, A key to the North American genera of Stipeae (Poaceae, Pooideae) with descriptions and taxonomic names for species of Eriocoma, Neotrinia, Oloptum, and five new genera: Barkworthia, x Eriosel, PhytoKeys 126, pp. 89-125: 103

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Ptilagrostiella kingii (Bol.) Romasch., comb. nov.


Ptilagrostiella kingii (Bol.) Romasch., comb. nov.  LSID 

Stipa kingii  Bol., Proc. Calif. Acad. Sci. 4: 170. 1872 [Basionym] ≡ Oryzopsis kingii  (Bol.) Beal, Grass. N. Amer. 2: 229. 1896 ≡ Ptilagrostis kingii  (Bol.) Barkworth, Syst. Bot. 8(4): 417. 1983. Type: USA, California, Tuolumne Co., Mt. Dana and Toulumne Meadows, 7000-12000 ft, Sep 1866, H.N. Bolander 6097 (lectotype: CAS-0005666 [image!] designated by M.E. Barkworth, Syst. Bot. 8: 417. 1983; isolectotypes: BM-001042147 [image!], F-0047023F [image!], G-00176575 [image!], G-00176576 [image!], G-00176577 [image!], GH-00361770 [image!, NY-01785914 [image!], US-81910!, YU-000920 [image!], YU-244788 [image!], W-18890217500 [image!]). Fig. 4 F–J.

Distribution and habitat.

Ptilagrostiella kingii  is endemic to California known only in the Sierra Nevada (Fresno, Inyo, Madera, Mariposa, Mono, Tulare, and Tuolomne counties) and is associated with lodgepole and subalpine forests ( Calflora 2018). The species grows along moist streambanks and open, wet to dry meadows; 2000-3650 m ( Barkworth 1983, 2007).


In our earlier molecular analysis, Ptilagrostiella kingii  is sister to a well-supported clade of Piptatheropsis  ( Romaschenko et al. 2011, 2012). As indicated by Barkworth (1983), the similarities between P. kingii  and Ptilagrostis  may have resulted from convergent evolution in distantly related taxa growing under similar environmental conditions since the former species shares an immediate common ancestor with Piptatheropsis  and does not align near the Ptilagrostis  clade ( Romaschenko et al. 2012). Ptilagrostiella kingii  also lacks a blunt callus and the plumose awns characteristic of most Ptilagrostis  species ( Wu and Phillips 2006).