NOVA ADDENDA AD FLORAM PATAGONICAM 189 



229. Baccharis cilindrica DC = DC, Pr. V, f. 426. 



Hab. Non rara sub umbra arbuscularum in altiplanitie secus 

 Rio iNegro, Jan. et Febr. 1898 (C. S.). 



230. Baccharis MELANOPOTAMicASpeg., n. sp. 



Diag. Perennis fruticulosa "párvula subglaherrima, ramis graci- 

 libus sulcaío-striatis acrogene monocephalis, foliis alternis lan- 

 ceolato V. spathulato-sublinearibus sessilibus subuninerviis 

 margine pectinatim denticulato-spinulosis, capitulis subcorym- 

 bosis turbinatis bracleis 4-5 seriatis lanceolatis aculis obscure 

 viridibus, margine pallidis vix ciliolato-pubescendbus. 



Hab. Vulgata in aridissirais altiplanitiei secus Rio Negro, Jan. 

 elFebr. -1898(0. S.). 



Obs. Rhizoma plus minusve profunde delitescens ramosum, ra- 

 mis subterraneis elongatis subcarnosulis (15-25 cm long. = 

 2-4 mm crass.) albescentibus glaberrimis laxe adpresseque 

 alterne squamulosis V. cicatricosis, superficem solí attingen- 

 tibus ibique ramos aéreos emittentibus. Rami aerei fruticu- 

 losi erecli v. subprostrati (10-25 cm long. -- 1-2,5 mm crass.) 

 solitarü V. saepius subfastigiatis, a basi plus minusve laxe 

 adpresseque alterne ramulosi virides v. subcinerascentes longi- 

 tudinaliter sulcato-striati glabri v. saepe (praecipue in juven- 

 tute)laxissirae minutissimique pulverulento-hispiduli, laxiu- 

 scule folios], ápice monocephali; folia infera lineari-spathulata 

 internodiis duplo triplove longiora (10-15 mm long. = 4-5 

 mm lat.) obtusiuscula, media sublineari-lanceolatainternodia 

 aequaatia (8-10 mm long. = 2-2,5 mm lat.) subacutiuscula, 

 suprema linearía internodiis breviora (4-5 mm long. = 1 mm 

 lat.) acuta, omnia erecta ramis satis adpressa, membranácea 

 rigidula glaberrima epunctata (v. vix in prima juventute, sub 

 lente valida, minute obsoleteque punctulata) plana, deorsum 

 non V. vix attenuata sessilia non amplexicaulia, ima basi 

 3-nervia, sed nervis duobus lateralibus mox evanidis, terlio 

 centrfili tamen dorso ad apicem fere usque perspicuo, margi- 

 gine laxe pectinatim denticulato-spinulosa, dentibusutrimque 

 saepius 6-9 parum prominulis sed spinulis (vix in foliis non- 

 nuUis supremis deficientibus) patentissimis elongatulis (0,5- 

 mm long.) acutis rigidulis albicantibus armatis. Capitula ad 

 apicem ramorum solitaria sed in planta corymbosula, tur- 

 binata (6-7 mm long. ^4 mm diara.) postice rotundata, basi 



