PATAGONIAN EXPEDITIONS I BOTANY. 



9. P. PUSILLUS Linn. 



Stem compressed-terete, very slender, branching. Leaves all sub- 

 merged, linear, 3-nerved, alternate or opposite, sheathing at the base ; 

 stipules connate, distinct from leaf, with a gland at their base. Spike 

 stalked, slender, interrupted, 3-io-flowered. Peduncle 2-3 times longer. 



(Eur. ; N. Am.) ; S. Patagon., by Gregory Bay; Fuegia. 



Family 7. JUNCAGINACE^E. Arrow-grass Family. 



Marsh-herbs with glabrous narrow rush-like radical leaves, sheathed at 

 base, and small inconspicuous 6- or 4-merous flowers in a spike or a 

 raceme. Perianth 2-seriate. Stamens 6 or 4, hypogynous, the anthers ex- 

 trorse, subsessile. Carpels 3-6, i-2-ovuled, more or less united. Embryo 

 straight; endosperm none. (Ovules solitary in the Patagonian forms.) 



KEY TO THE GENERA. 



1. Flowers 4-merous. 



2. Flowers 6-merous. 



3. Flowers i-merous. 



Tetroncium. 

 Triglochin. 

 Lilcea. 



Chilian Andes. 



i. TETRONCIUM Willd. 



Flowers 4-merous, dioecious. Styles distinct. Staminate flowers with 



FIG. 29. 



Tetroncium magellanicum. Herbage (below, to right) ; flower and floral spike ; fruit and fruiting 

 spike. (After Flora Antarctica.) 



