﻿~v2 Plántete novae nonnullae. 



4. Senecio argentinensis Speg., n. sp. 



Diag. Radiatué gláberrimus herbaceus elatus corymbo- 

 sus, fóliis linearíbus basi utrimque 1-3 -inciso- dentatis, 

 capvtulis pedicellis bracteolis linearíbus donatis suff'ultis, 

 ligulis álbis. 



Hab. Ad muros vetustos iu urbe Buenos x\ires et in 

 ruderatis ]>rope La Plata, rarus per annis 1890-94. 



Obs. Annuus?; caules elati 1 v. 1 V 2 metrales, ramosi 



Ltrales erecti, laterales ebasi arcuato-adscendentes, pa- 

 rum ramulosi, omnes teretes obsolete striati fistulosi; fo- 

 lia omnia linearía v. lanceolato-linearia (9-20 cm long. 

 = 5-20 mm lat.) sessilia non decurrentia patula saepius 

 arcuato -recurva, antice acuta postice non v. vix atte- 

 nuata, Ínfima integerrima, media prope basin denticulis 

 1 v. 2 minutis remotiusculis ornata. suprema saepius 

 prope basin utrimque dentibus majusculis v. melius lobis 

 linearibus acutis (usque 10 mm long. = 2-3 mm lat.) 

 remotis donata, subcrassiuscule membranácea, viridia, 

 inferné pallidiora. 



Inflorescentia eorymboso-paniculata, in a])iee caulium 

 ramorum ramulorumque : ramululi capituligeri ex axdlas 

 foliorum supremorum orti (2-10 cm long. = 1 mm crass. ) 

 erecto- di varicatuli nudi v. vix 1-foliolati. ápice 2-5- 

 pedicelligeri; pedicelli alterni erecti recti (5-25 mm long. 

 = 1,5 mm crass.) basi foliólo florali suffulti et bracteo- 

 lis 3-6 linearibus angustis acutis integris v. vix denticu- 

 latis (5-8 mm long. = 1 mm lat.) divaricatis inter se 

 remotis ornati. 



Capitula in ápice pedicellorum saepius solitaria ma- 

 juscula cylindracea (20 mm long. sine ligulis = 6-8 mm 

 diam bas.) circa basin bracteolis, illis pedicellorum simil- 

 limis, 6-9 adpressis calyculata; involucrum uniseriale 

 bracteis 15-17 subcoliaerentibus linearibus, latitudine 

 nonniliil inaequalibus, antice attenuatis acutis, ápice pun- 

 cto minuto nigro triangulari notatis atque penicillato- 

 sphacelatis, ceterum glabris viridibus (11-12 mm long. = 

 1-1,5 mm lat.) efformatum; rece2)taculum planum viride 

 glabrum minute clenseque alveolato-denticulatum. 



