GRIFFITHS—THE GRAMA GRASSES. 369 
oftheculm. There are no differences between them in the spikelets and floral details. 
Miguel Bang’s no. 81, of the John Donnell Smith collection, combines these two 
characters in one plant. Both of the Philippi specimens are from the Province of 
Tarapaca in the extreme northern part of Chile. South American material is very 
scanty in North American herbaria, and it may be that when more of it becomes 
available a still closer relation will be shown between this and B. procumbens. 
HERBARIUM SPECIMENS. 
Soutu America: Fries 1058a, Bolivia; 813, Argentine. Bang 81, Bolivia. Philippi, 
267 and 208, Chile. Rusby 34, Bolivia. Stuckert, Herb. Argent. 17700. 
8. Bouteloua stolonifera Scribn. 
Bouteloua stolonifera Scribn. Proc. Acad. Phila. 1891: 302. 1891. The type is 
Pringle 3174, in the U.S. National Herbarium, from Honda Station, Zacatecas, Mexico, 
August 19, 1890. 
DESCRIPTION. 
A densely tufted, strongly stoloniferous, low, smooth perennial; sheaths short, 
indistinctly striate; blades flat, narrow, 3 to 5 cm. long, with involute edges, minutely 
scabrous under a lens, abundant and mostly radical; spikes solitary upon short, erect 
or ascending culms, 5 to 10 cm. high, recurved into a circle when mature, 2 to 2.5cm. 
long; spikelets lax, 15 to 20, pectinate, about 15 mm. long including awns; glumes 
lanceolate, acuminate, the first 5 and the second 8 mm. long, smooth or minutely 
hispidulous on the keel; lemma smooth, 8 to 10 mm. long, including 3 long, unequal, 
hispid awns, the central 1 to 2 mm. longer than the lateral; palet about 5 mm. long, 
narrow, with involute margins, the 2 awns about 1 mm. long; rudiment consisting of 
2 or 3 aborted florets in the shape of 5 to 8 or more long, hispid awns and 3 to 5 small 
scales upon a short stipe about 1 mm. in length; caryopsis not seen. (Figure 30.) 
When not headed out this species resembles somewhat the female plants of Bulbt- 
lis dactyloides. It often grows thick enough in shallow depressions in the mesas to 
make a semblance of a turf. Extensive areas of it have not been seen. 
HERBARIUM SPECIMENS, 
Mexico: Lloyd104, Cedros, Zacatecas. Schaffner 1879, San Luis Potosi. Pringle 3174, 
La Honda Station, Zacatecas. 
4. Bouteloua scorpioides Lag. 
Bouteloua scorpioides Lag. Gen. & Sp. Nov. 5. 1816. This species is identified 
on no other evidence than the brief description, ‘‘Culmo erecto filiformi mono- 
stachyo: spica lineari-oblonga spiraliter revoluta,’’ and the additional information 
that the plant is from ‘“‘N. Hisp.’’ and perennial. Fournier referred this to Chondro- 
sium tenue Il. B. K., to which it is closely allied, the difference between them con- 
sisting chiefly in the perennial character of Bouteloua scorpioides. Fournier does not 
appear to have seen this species at all and consequently it was perfectly natural for 
him to refer this name to the annual C. tenue, which it so closely resembles. 
Actinochloa ? scorpioides Roem. & Schult. Syst. Veg. 2: 420. 1817. Based upon 
Bouteloua scorpioides Lag. 
Atheropogon scorpioides Spreng. Syst. Veg. 1: 293. 1825. Based upon Bouteloua 
scorpioides Lag. 
Chrondrosium? scorpioides Kunth, Rév. Gram, 1: 94, 1829, Based upon Bouteloua 
scorpioides Lag. 
