50 



28a. BROMUS PUMPELIilANUS TWEEDYI Scribn. in Beal, Grass. N. A. 

 2: (>22. 1896. 



This differs from the species in having the leaves and sheaths usually iiilose-pubescent 

 throughout and the flowering glumes with coarser, denser, hirsute-pubescence. 

 In other respects like the species. 



Type No. 587, collected by Frank Tweedy, Slough Creek, Yellowstone Park. 



General distribution apparently the same as for the species. 



Specimens E.xAMiNED. — Colorado: (H. N. Patterson 29 ) ; (M. E. Jones.) Wyoming: Sun- 

 dance (D. Griffiths 435,884); 

 Meeteetse Creek (T. A.Wil- 

 liams 2917); Welcome (T.A. 

 Williams 2673, 2682); Bear 

 Lodge (T.A.Williams 2655). 

 Montana: Lima (P. A. Ryd- 

 berg 2309, C. L. Shear 568). 

 Akuska: Yukon River (Daw- 

 son 92) . 



28/3. BROMUS PUMPELLI- 

 ANUS MELICOIDES n. var. 



This is a form having the sheaths 

 retrorsely pilose-pubescent, es- 

 pecially on the lower half to- 

 wanl the nodes. The pubes- 

 cence on the margins and <)f 

 the flowering glume is ratlier 

 short and scanty, and the awn 

 is entirely wanting or some- 

 times 1 mm. long. 



Type collected by Dr. L. H. Pam- 

 mel, Beaver Creek Camp, Colo- 

 rado, July 8, 1896, altitude 

 about 3400 meters. This 

 plant is rather intermediate 

 between B. pumpeUianas and 

 B. inermis, but is apparently 

 an endemic form and belongs 

 rather with the former than 

 the latter. The obtuse glumes, 

 with thin, purple margins, 

 give the plant a strong resem- 



. , .^ , , , , » 1 blance to Melica, whence the 



Bromus unioloides : a, empty glumes; b, lateral ' 



view of a flowering glume. name. 



Y. CERATOCHLOA (Beauv.) Benth. & Hook. 



« 



Spikelit large, i<tr(nif)hi mm presided, and more or less keeled. 



29. BROMUS UNIOLOIDES (Willd.) H. B. K. Festuca unioloides Willd. Hort. 

 Berol. 1 : 'd.pl.ii. 1806. Bronnis unioloides H. B. K. (?) Nov. Gen. et Sp. PI. 1 : 

 151. 1815. Bromus cartharticus Vahl. (?) Symb. Bot. 2 : 22. 1791. Ceratochloa 

 pendula Schrad. Linn?ea, 6 : Lift. 72. 1831. Ceratochloa schradtri Kunth, Enum. 

 PI. 1 : 416. 1833. Ceratochloa brevlarislata Hook. V\. Bor. Am. 2 : 253. 1840. 



