( 63) 



30 Cli. squamosa : caule sequaliter striato aut coiUorto sulcato-slriato, 

 superne aculeolis s. papillis raris, brevissimis, deflexo-adpressis obsito ; 

 verticillis abbreviatis, densis, coarctatis, subglomeratis, 15 — 20-radia- 

 tis • involucri papillis biserialibus, in singulis seriebus circiter ramen- 

 lorum niimero, oblongolinearibus, adpressis, diametro caulis multo brc- 

 vioribus; ramenlis multiarticiilatis, geniculis constrictis ; internodio 

 basali passim, proximo rarissime corticatis, ceteris simpliciter tubulosis, 

 in sicco concavis, terminal! obtuso vel mucrone obtuse munito ; brac- 

 teis ad geniculum infimum, oblongo-lincaribus, obtusis, interioribus 4 — 

 5, nucula longioribus, exsiccatis late ligamentaceis, aversis papilla;for- 

 mibus, minutissimis; nucula grandi, 11 — 13-striata. Monoica. 



Ch. squamosa Desfonl. Flor. Atlant. — Willd. — Bnizel. — Agardh. 

 — Al. Braun Monogr. — Kiitz. Spec. Alg. 



Afrique, Barbarie , dans les lacs ! Desfontaines (Herb. Hornem.) 



D'un vert grisatre, un peu blanchatre ; par son habitus, ressemblant an 



Ch. coarctata. 



31 Ch. gymnopliylla : caule corticato, striato, aculeolato papilloso; ver- 

 ticillis 10 — radiatis ; involucri papillis biserialibus, minutis; inlernodiis 

 ramentoruni omnino ecorticatis, nudis, ad genicula inferiora bractei- 

 feris; bracteis internis elongatis, aversis obsoletis ; nucula 13-striata; 

 coronula truncata, brevi. Monoica. 



Ch. gymnophylla Al. Braun, Monogr. 1. c. Schweiz. Char. — Kictz. 

 Spec. Alg. 



Afrique, Alger. — Suisse. — France! — Italie. — Dans les eauX sta- 

 gnantes. — Fort ressemblant au Ch. coarctata. (p. 304) 



p. Exalbido- vel virenti-canescentns. 



Verticillis fructiferis evolutis; internodiis sumniis ecorticalis, nudis, ceteris 

 corticatis, striatis. 



32 Cli. ffetlda : Ifete virens, incrustata canescens, elongata, filiformis; 

 caule subinermi, striato, tubulis secundariis prominentibus; verticillis 

 sub8-radiatis, fructiferis patenti-incurvis; involucri papillis minutissi- 

 mis; ramentis tenuibus, elongatis; internodiis plurimis corticatis, at- 

 tenuatis, ad genicula fructiferis, summis ecorticatis, nudis, terminali 

 elongato, obtuso; bracteis interioribus 4, attenuatis, 2 ssepius longissi- 

 mis nucula 3 — 4-plo longioribus, reliquis nuculam subfiequantibus, 

 aversis obsoletis; nucula oblonga, demum nigricante, 13-striata; co- 

 ronula contracta. Monoica. 



Ch. vulgaris «. IVallrol/i . Ann. holan. — Ch. fdMid.i .1/. finnni . Monogr. 



