PATAGONIAN EXPEDITIONS I BOTANY. 



rays and raylets opposite, not whorled. Glumes stramineous ; the floral 

 glume half as long as the lower, awnless. 

 W. Patagon. ; by Rio Palena. 



29. A. TEHUELCHA Speg. 



(Glabrivalvule, bivalvule, microvalvule.) Awnless, all glabrous. Leaves 

 plane, narrow, rather short, herbaceous; ligules ovate, longish. Lower 

 2-3 nodes of the culm sheathed above the middle. Panicle contracted, 

 spike-like, lobately subinterrupted, erect; rays short, appressed, densely 

 spiculiferous from the base or nearly so. Spikelets lanceolate, small. 

 Keel and sides of glume spinulose-rough, acute-awned. Callus glabrous. 



Patagon., in wet places along Rio Sta. Cruz, and Carren-leofu. 



30. A. TENUIFOLIA Bieb. 



Culms about 50 cm. tall, with subsetaceous, obscurely scabrid leaves. 

 Floral glume truncate, 4-toothed, 4-nerved, with or without a short dorsal 

 awn ; palea none, or very short. (Near A. exarata Trin.) 



(Eurasia) ; Magellan. 



31. A. UMBELLATA Colla. 



Culm and linear leaves both strict and rather scabrous. Panicle con- 

 tracted, glabrous. Rays verticillate, the verticils umbellate ; raylets capil- 

 lary, subquaternate, i -flowered. Empty and floral glumes equal, acumi- 

 nate, scarious, awnless. Grain free. 



(Chili) ; Chubut, in mountain meadows near Rio Carren-leofu. The 

 Patagonian specimens vary ; spikelets stramineous or violascent. 



32. A. VAGINATA Phil. 



Culm 27 cm. tall, entirely sheathed. Leaves 3 mm. broad, smooth, also 

 the sheaths. Panicle contracted, 6-5 cm. long, the semi-verticils approxi- 

 mate. Glumes violet; floral glume half as long as the lower, its awn 

 exserted. 



W. Patagon.; valley of Rio Palena. 



23. CALAMAGROSTIS Adans. (including Deyeuxia Clar.). 



Panicles having i -flowered spikelets, often with the rudiment of a 

 second. Glumes 3, 2 of them empty, keeled, the third or floral glume, 

 shorter, obtuse, dorsally awned, hairy at the base, enclosing a shorter 



