1910] Pease & Moore, 
Agropyron caninum and Allies 67 
‘type’ is not technically such, Vasey not having cited any type, it seems 
wisest to derive the name of the form from A. Gmelini var. Pringlei, 
the identity of which cannot be questioned. 
The last plant to be considered is that called by Scribner and Smith 
Agropyron Richardsoni (Trin.) Schrad. The evidence for identifying 
this name with the plant in question is extremely weak. ‘The original 
description of Triticum Richardsoni Schrad.! reads as follows: “ Agro- 
pyr. Richardsonii Ind. sem. H. Berol. 1832.— America borealis arctica 
? 2L — A Trit. repente vulgari differt foliis firmioribus serius involutis 
spica graciliori; spiculis minus distichis paucifloris, floribus longius; 
aristatis." It is true that the use of the expression, '''Trit. repente,” 
may not be accurate, but is there any reason for assuming this? Surely, 
J 
"longius aristatis," is a mild statement for the longest awns in our 
group. Besides the published evidence, there is some supposed further 
documentary evidence. Scribner and Smith ? say, “ Triticum richard- 
sont ‘Trin.* in Reliq. Scrad. [sic.], Linn., 12: 467 (1838), according to 
a specimen from the St. Petersburg Academy in the Gray Herbarium." 
The only specimen of this species from St. Petersburg in the Gray 
Herbarium is labeled: “Ex herbario horti Petropolitani, ‘Triticum 
Richardsoni? = T. violaceum, Hornem.” The expression, “= T. 
violaceum, Hornem.,” is added in the handwriting of Dr. Gray, and 
the quotation marks seem to be in an ink of the same date, leaving 
“Triticum Richardsoni,” carelessly written in an unknown hand, as 
the only original label. Under “A. richardsoni,” * Scribner and 
Smith cite as seen in the Gray Herbarium: ‘ British Columbia: Rich- 
ardson, type collection.” A careful search has revealed no such 
specimen. Probably “ Gray Herbarium ” is an error. 
There is, however, a good name for the plant under discussion, 
namely, Agropyrum caninum (L.) Beauv. var. unilaterale (Cassidy) 
Vasey;? A. unilaterale | Cassidy. Cassidy’s description follows: 
“Flowering glume finely scabrous, flattened and obscurely nerved 
below; apex rougher, acutely two-toothed, the mid-nerve terminating 
in a rough, straight awn 2 inches long? Banks of streams 7,000 to 
1 Linnaea, xii, 467 (1838). 
? U. 8. Dept. Agr. Div. Agrost. Bull. no. 4, 29 (Feb. 6, 1897). 
3 There is no evidence that Trinius is the authority. 
* The original authority for A. Richardsoni is Hort. Berol, It appeared as a nomen 
nudum in the Ind. Sem. Hort. Bot. Berol. 1831 Collect (1832), a copy of which 
A. H. Moore was permitted to see at the Berlin Botanical Museum. 
5 Contr. U. S. Nat. Herb. i, 279 (Oct. 31, 1893). 
5 Colo, State Agr. Coll. Exper. Sta. Bull. no. 12, 63 (July, 1890). 
7 We wish to call attention especially to his measurement of the awns, which is even 
rather extreme. 
