2l8 PATAGONIAN EXPEDITIONS I BOTANY. 



tween the female flowers only. Glumes all keeled and acute; the floral 

 broadest ; palea with prominent keels. 



Species 4, America ; i of them also in Australia. 



i. D. SCOPARIA (Kunth, sub Poo] Arech. 



C^ilms fasciculately branching, the branches subfastigiate, leafy. Leaves 

 narrowly linear, convolute-setaceous, acute-pungent, rigid, with glabrous 

 sheaths. Female spikelets 3-5, branching, oblong, acute, compressed, 

 5-6-flowered, glabrous. Flowers not bearded. Floral glume about i- 

 nerved. 



(Montevideo) ; S. Patagon., by Rio Chico. 



2. D. SPICATA (Linn.) Greene. 



Glabrous, 60 cm. tall. Sheaths long, overlapping; ligules a ring of 

 hairs. Panicle dense, strict. Much varying. 



(N. Amer. and S. Amer.; also Austral. Brit. & Br. i, 198.) N. Patagon., 

 on sandy and saline soil. "Granilla de salistral." (J. Ball.) 



D. SPICATA HIRTA (Phil.) O. Ktze. 



Hairy, at least the lower leaf-sheaths. 

 Patagonia. 



49. BRIZA Linn. 



Panicle usually open. Leaves flat or convolute. Spikelets large, flat, 

 tumid, usually many-flowered, nodding. Glumes strongly concave. 

 Floral glumes broader; uppermost often empty. Palece much shorter. 



Species 12, Old World, and temperate S. Amer. 



i. B. SUBARISTATA Lam. (B. lamarckiana Nees. Festuca 



commersonii Spreng.) 



Like B. triloba, but taller, 22 cm., and with orbiculate-cuspidate floral 

 glume. Spikelets elliptic-ovate, about 11 -flowered. Panicles erect, 25 

 mm. long, contracted; its rays sub-binate, i-spiculate. 

 (Montevideo); N. Patagon. (?) 



2. B. TRILOBA (Nees). 



(Calotheca, glumes awned, floral glumes with projecting lateral angles.) 

 Culm low, about 15 cm., simple. Leaves erect, convolute, rough; ligules 

 short. Panicle rather contracted, its rays 3-parted. Spikelets subtetrag- 



