152 PATAGONIAN EXPEDITIONS: BOTANY. 



4. T. STRIATA Ruiz & Pavon. 



Rhizome stoloniferous. Leaves linear, semi-cylindric, almost equalling 

 the scape. Raceme many-flowered, flowers brevi-pedicillate, erect-spread- 

 ing. Inner stamens often abortive. Fruit globose ; carpels of ripe fruit 3. 



T. STRIATA FILIFOLIA. 



Rarely exceeding 25 cm. high, the leaves narrowly linear or filiform, 

 often longer than the scape. Sir Joseph Hooker says (Flor. Antarct. ii, 

 360) that it greatly varies in size, the scape sometimes exceeding, some- 

 times being shorter than the leaves. 



T. STRIATA HUMILIS. 



Scape i -flowered, shorter than the leaves. Fruit ovoid, of 6 carpels. 

 Leaves linear to filiform. 



(Found in New Zeal., Tasmania, Australia, Auckland I., Chili, S. Brazil, 

 Argentina, Peru, and thence northwards to the S. United States ; also in 

 South Africa.) At Rio Coy, S. Patagon. by O. A. Peterson, Dec. 17, 1896. 

 (This has leaves shorter than the scape, pedicels 4 mm., fruit 3 mm.) 



Family 8. ALISMACE.E. Water-plantains. 



Aquatic or marsh herbs, usually glabrous, with fibrous roots, scapose 

 stems, sheathed by basal, long-petioled leaves. Flowers racemed or 

 panicled, regular, with whorled pedicels subtended by bracts. Sepals 3 ; 

 petals 3, larger, imbricated. Stamens 6 or more. Carpels superior, mostly 

 numerous and separate, i -celled, usually i -seeded. Seeds and embryo 

 curved. No endosperm. 



Species 70, cosmopolitan by fresh water. 



i. ECHINODORUS Rich. 



Each floral verticil with 3 outer bracts and many inner bracteoles. 

 Petals white; receptacle large, subglobose. Stamens 12-30. Achenes 

 ribbed and beaked, forming spinose heads. 



Species 14, mostly American. 



i. E. GRANDIFLORUS (Cham. & Schl. sub Alisma] Michel. 



Leaves cordate, obtuse. Raceme simple or compound, many-flowered. 

 Petals twice as long as the calyx. Style uncinate. 



(S. Brazil) ; frequent near Rio Negro, by Carmen de Patagones. 



