136 PATAGONIAN EXPEDITIONS: BOTANY. 



A. FILICULOIDES Lam. (A. magellanica Willd.) 



Racemosely branching ; a root on every branch. Upper leaf-lobes with 

 i -celled, broadly based hairs. Leaves closely imbricating, oblong, obtuse, 

 membranaceous margined, not reddish. 



Figs, in Engl. & Pr. i. 4, pp. 385, 388, 396, 397. 



(California to Chili, Brazil, & Patagonia); S. Patagonia, in stagnant 

 waters. 



Magellan ; Falklands. 



A. caroliniana W. (of N. America, to Calif, and by New Mexico to S. 

 America) has spreading leaves, reddish below, not membranaceous at the 

 margin. (Vid. in B. & B., I, p. 35.) 



Fam. 8. EQUISETACE.E. Horsetails. 



Erect plants with jointed hollow and fluted stems, having whorled 

 branches and leaves reduced to sheaths at the joints. Sporesacs i -celled, 

 suspended under the peltate polygonal scales of the terminal cone-like 

 spikes. Spores of one kind, with 4 club-shaped elaters. 



Species 25, widely distributed. 



EQUISETUM Linn. 

 The only genus at present existing. 



E. RAMOSISSIMUM H. B. & K. 



Stems erect, to 1.5 meters tall, terete, as thick as the little finger, the 

 ribs swollen, not angulate ; sub-simply branching, the branches 6-10 at 

 each joint, glabrous, hexagonal, themselves with one or two branchlets. 

 Rows of stomata 1-4 in the same plant. Teeth of sheaths spreading, 

 membranaceous, whitish, acute. 



(Widely distributed. Got by Trelease in the Azores; Caraccas); at 

 Bahia Blanca, and probably in N. Patagonia (may be that seen by 

 Hatcher in Laguna Leona, Vol. I, p. 41). 



Fam. 9. LYCOPODIACE^;. Clubmosses. 



Mosslike erect or trailing land plants with dichotomously dividing axes 

 ending in spikes. Sporecases in the leaf-axils of the spikes, spores all 

 of one kind, without elaters. 



