264 PATAGONIAN EXPEDITIONS : BOTANY. 



b$. Slender. Spike oval, i-bracted. Achene 2-edged. uniglumis. 



64. Style bifid or trifid. Setae rigfd, persisting. Bulb rugose. Spike terminal. 



sulcata. 

 at. Style 3 -cleft. 



t. Stems minute, setaceous. Flowers distichous. Setae 2-4. acicularis. 



&2. Stems filiform. 



c. Spike solitary, bractless, dark purple. Achenial bulb conical. Setae 3~4-(6). 



inelanocepliala. 

 c2. Spike sublateral, with bract-like scale. Style trifid less than half-way ; bulb as broad 



as the achene. pachycarpa. 



#3. Achene transversely striate. Culm triangular-filiform. Setae 3-4. striatula. 



i. H. ACICULARIS Roem. & Sch. 



Stems setaceous, almost round ; sheaths leafless. Spike ovate, acute. 

 Glumes equal, acute. Stigmas 3. Setae 2-3. 



H. ACICULARIS LILLIPUTIANA Speg. 



Cespitose, with small cttlnis, 5-10 mm. long, quadrangular, green, pur- 

 plish-sheathed at base ; spikes acrogenous, 4-y-flowered, flowers disti- 

 chous, scales ovate-elliptical, obtuse, entire. Setce 4, retrorsely spinulose. 



Patagon., in river swamps near Golfo de San Jorge. 



* 



2. H. FUNEBRIS Speg. 



Rhizome thick, creeping. Ciilms low, densely fasciculate-cespitose, the 

 fertile and sterile intermixed ; terete or subangulate, scarcely sulcate, 

 smooth, green, leafless, sheathed at base ; sheaths wine- or dark-purple- 

 colored below, pallid upwards, obliquely truncate and submucronulate. 

 Spike strictly acrogenous, fusoid-subovate, many-flowered ; scales ovate, 

 acutish, obsoletely i -nerved, often dorsally green and marginally dark- 

 purplish. Stamens 3, minutely mucronulate, with none-3 slender, retrorse 

 setae, just surpassing the ovary. Style cleft from the middle, moderately 

 bulbose-thickened at base. Achene obovate, ventrally flat, dorsally con- 

 vex ; stylar-bulb persisting with a constriction below, fuscous-yellow, 

 smooth, or obsoletely reticulate-punctulate. 



S. Patagon., in swampy elevations near Rio Carren-leofu. 



3- H. MELANOCEPHALA DeSV. 



Small, handsome, creeping, with filiform culms, 2.5-5 cm - high, strict, 

 often curved, leafless, sheath purple. Spike black-purple, solitary, bract- 



