68 PATAGONIAN EXPEDITIONS : BOTANY. 



and not hollow and jointed, but triangular, solid and jointless ; and that 

 in the seed the minute embryo is enclosed in the endosperm at its base, 

 the seed being itself enclosed in the lodicule, whilst the embryo of Grasses 

 remains external to the endosperm, the leaves being in 2 rows in the 

 Grasses and 3-ranked in the Cyperaceae. 



Kiikenthal divides the Sedge-like plants into a large number of chief 

 sections, distinguished partly by structure and partly by habitat; and 

 groups all the leading species within a comparatively small number of 

 genera : the chief genera being Uncinia, or Hooked Sedges, which are 

 chiefly characteristic of the Southern Hemisphere, and Carex, which is 

 cosmopolitan. In the first half of the Caricoideas, we encounter three 

 genera, Schcenoziphium, Cobresia, Uncinia, and in the latter half the only 

 genus is Carex. 



The first of the genera, which we may call No. i is confined to Africa, 

 and characterized by very simple monoscious flowers. The next genus, 

 No. 2, is Cobresia Willd., containing numerous species in the Asiatic alps, 

 and two species found in the Arctic and alpine parts of Europe, and in 

 the Canadian mountains. They form four sections of genus Cobresia. 

 Our next type is the genus Uncinia Pers., having two subgenera, and two 

 sections of the first subgenus, thus named. 



Genus Uncinia, with hooked rachil ; No. 7. 



Subgenus Eu- Uncinia, rachil long-hooked; No. 8. 

 Subgenus having two sections. 



Section i, Platyandrae, filaments dilated; No. 9. 

 Section 2, Stenandrae, filaments filiform, not dilated ; No. 10. 

 Subgenus Pseudocarex Kiikenth., rachil with very short hook ; 



No. 1 1 . 

 Lastly we have the type, 



Genus Carex L., No. 12, usually with no rachil, and never with a 

 hook. 



UNCINIA Pers. Macl., p. 268. 



The appearance of Kiikenthal's treatise on Cyperaceae-Caricoideae enables 

 us to improve our treatment of the Patagonian sedges. As the only dif- 

 ference between Uncinia and Carex appears to be that -in all the Unciniae 

 the seta is hooked at the apex, whilst it is never hooked in Carex ; we 

 may distinguish them as the Hooked Sedges and the True Sedges. 



Kukenthal gives the Uncinia kingii Boott a place by itself, because its 



