42 
Either T. trachycaulum or T. subsecundum, being published simul- 
taneously, could be taken up as a name for the Linneon under discussion. 
The writer prefers the former, because the description of T. subsecundum 
contains an obvious, though no doubt accidental, contradiction. In the 
brief diagnosis the empty glumes and lemma are described as follows: 
“Valvae multinerviae aristatae valvulis (arista excepta) longiores,” whereas 
in the following full description it reads: “Valvae ad lin. longae. 
Valvula externa parum ultra 2 lin. longa ” From the latter descript- 
ion it would appear that the empty glumes are at most half as long as the 
lemma, which is contradictory to what is said in the preceding diagnosis. 
Obviously, in the wording “Valvae ad lin. longae” a figure has through an 
oversight been omitted. 
Agropyron trachycaulum (Link) n. comb., emend, nova, adjectis 
formis glumellis exterioribus longiaristatis pubescentibusque. 
Triiicum trachycaulum Link, Hort. Reg. Rot. Berol., II, p. 189 (1833), 
sens, ampl. 
A. violaceum (Hornem.) Lange 0 virescens Lange, Consp. FI. Groenb, 
155 (1880). 
Perennis, caespitosus radice fibrosa. Caulis saepissime erectus, ad 
supra 1 m. altus, viridis vel glaucus, glaber vel infra spicam scabriusculus. 
Folia plana, 2-8 mm. lata, rigidiuscula vel laxa, asperrima vel leves, viridia 
vel glauca, interdum superne pilosa. Vaginae leves vel pilosae. Spica 
5-20 cm. longa, recta vel apice plus minusve curvata, concinna vel unilater- 
alis. Spiculae semper adpressae, 1-2 cm. longae, 3-7-florae. Glumae 
glumellis exterioribus infimis parum breviores, laneeolalae, glaberrimae 
vel scabriusculae vel pilosae, (3-) 4-7 (-8)-nerviae, sensim acutatae vel 
bre viter aristatae. Glumella exterior mutica vel arista longitudine ad 
3-4 cm. instructa, glabra vel plus minusve scabriuscula vel pilosa. Antherae 
1-2 mm, longae. Caryopsis apice plana. 
Perennial. Caespitose with numerous sterile basal shoots or, in shade, 
sometimes with isolated culms, without creeping rootstocks. Culms gene- 
rally erect, up to 1 in. high or more, green or glaucous, glabrous, sometimes 
minutely scabrous below the spike, and sometimes pubescent with short, 
retrorse hairs on and immediately below the nodes. Leaves 2-8 mm. wdde,firm 
to rather lax, green or glaucous; the blades scabrous or smooth, and sometimes 
pubescent above; the sheaths glabrous or, particularly the lower, retrorse- 
pubescent. Spikes 5-20 cm. long, straight or more or less curved at the 
top, symmetrical or unilateral. Spikelets, exclusive of awns when such are 
present, 1-2 cm. long, 3-7-flowered, erect, appressed to the rhachis, even 
during anthesis. Empty glumes at least two-thirds as long as the lowest 
lemmas, firm in texture, lanceolate, broadest at or below the middle, 
glabrous to finely scabrous or pubescent, (3-)4-7 (-8)-nerved, narrowly to 
obsoletely scarious-margined, the margin gradually petering out towards 
the acute to short-awned apex. Lemma awnless or with scabrous awn up 
to 3-4 cm. long, glabrous or more often finely scabrous, particularly on the 
nerves and in the upper part, or sometimes pubescent. Anthers 1-2 mm. 
long. Caryopsis flattened at the apex. 
