MR. G. BENTHAM ON GRAMINEZ. 85 
tufted Greek plant, with the spikelets flat as in PAalaris, but 
otherwise showing nearly the structure of Phleum. 
19. Pargum, Linn., about ten species from the temperate and 
northern regions of the northern hemisphere or from Antarctic 
America, is a well-known and already well-defined genus. It has 
been proposed to separate generically Chilochloa, Beauv. (Achno- 
don, Link), for the few species in which the rhachilla is produced 
beyond the flower into a minute bristle; the character, however, 
is in this instance very trifling and uncertain. Achnodonton, 
Beauv., is P. tenue, Schrad., for which I can find no separate 
generic character. The anomalous Phalaris trigyna, Host, appears 
to have been an individual specimen of Phleum Michelii, All., 
having abnormally three style-branches instead of two. 
In a third small group or subtribe, SPononoLr.z, I should pro- 
pose to place Sporobolus itself, with the three monotypie genera 
Mibora, Coleanthus, and Phippsia. The subtribe is not very 
clearly defined ; but my previous endeavours to associate Sporo- 
bolus with Miliym and Isachne, to which I shall recur further on, 
proved still less satisfactory. The plants now grouped together 
have small paniculate or almost racemose spikelets,awnless glumes, 
no continuation of the rhachilla beyond the flower, and the ripe 
grain only half enclosed in and readily falling away from the 
glume—characters sometimes well marked, but in some species 
rather vague. 
16. Mısora, Adans. (Chamagrostis, Borkh., Sturmia, Pers., 
Knappia, Sm.), is a dwarf slender tufted European annual, with 
a simple spike and the lower empty glume at least as long as the 
flowering one. 17. CorgANTHUS, Seid., isa minute annual, first 
found in Bohemia, then in Norway, and more recently gathered 
in the island of Sauvies at the mouth of the Oregon in North- 
west America. Itis very near Phippsia and Sporobolus; but the 
lower empty glumes are entirely deficient. It was first disco- 
vered by Seidel, and distributed by him under the name of Cole- 
anthus subtilis; but Trattinick in publishing it (as reported by 
Romer and Sehultes) retained only Seidel's specifie name, changing 
the genus to Schmidtia. Roemer and Schultes in their * Systema’ 
restored Seidel's name, whieh Sternberg, rather later, changed 
again both generieally and specifically to Sehmidtia utriculosa. 
Under these circumstances Seidel is now considered to have pub- 
lished his Coleanthus subtilis sufficiently for general adoption, 
more especially as another very different genus of Grasses has 
