ZOSTERA 



699 



Zosima Hoffm. (Zozimia EP.}. Umbelliferae (in. 6). 6 W. As. 



Zostera Linn. Potainogetonaceae. 6 temp., subarct., subtrop., in salt 

 water on gently sloping shores. Z. marina L. and Z. nana Roth, 

 in Brit, (eel-grass or grass-wrack). The lower part of the stem 

 creeps, rooting as it advances, and has monopodial branching; the 

 branches grow upwards and exhibit sympodial branching, com- 

 plicated by union of axillary shoot to main shoot for some distance 



A. Diagram of branching in floral shoot, i 6, successive shoots, every other one 

 being shaded; b l , #2... fore-leaves on these shoots; s/>, spathes (not indicated in 

 the upper shoots). B. Spathe of Z. nana with flattened spadix taken out; 

 v, the retinaculum; X2. C and D. Half-anther and pistil of same, more 

 enlarged. E. Fruit of Z. marina, the thin pericarp turned back to show the 

 seed, X2j. F. Diagram of a main axis, i, with its fore-leaf (/>') and the axil- 

 lary shoot 2, with its fore-leaf (b-) ; sp, spathe borne on 2, surrounding the 

 spadix; s, intravaginal scales; v, bracteole. G. Diagram of part of spadix 

 with two flowers ; v, bracteole. 



A, F, G, after Eichler; B, C, D, from English Botany; E, after Le Maout and 

 Decaisne. 



above its point of origin. This is most easily seen in the infl. region ; 

 the branching is that of a rhipidium, but shoot i, which springs from 

 the axil of a 1. on shoot i, is adnate to i up to the point at which the 

 first 1. is borne on i; this 1. occupies the angle between the two 

 shoots where they separate. Shoot i (and 2, 3, &c. successively) is 

 pushed aside and bears an infl. (Eichler's Bliithendiag. or Nat. Pft. 

 for details and figs.) L. long, linear, sheathing at base. 



