— 177 — 



\>) Nigrescens Zahn. 



Subspecies rhaeticum Fr., Epicr. (1862) p. 46; Christener, Hierac. der Schweiz (1863) 

 p. 6; H. fuliginosum Lagger in sched., non Laestad.; H. Halleri Schl. in sched. ex p.; 

 H. nigrescens Christen., Mitt. Berner naturf. Ges. (1860) p. 88. Caulis tenuis v. subgracilis 

 =b pilosus, superne canotomentosus, usque infra medium tenuiter glandulosus, usque ad 

 basin floccosus, saepe nonnullis caulibus lateralibus praeditus. Folia rosularia viridia, 

 4 — 8 evoluta, exteriora =t ovata v. oblongo-spathulata obtusaque, reliqua oblongo-lanceolata 

 V. lanceolata it sensim in petiolum longum =h alatum tenuiter molliterque subvillosum an- 

 gustata, obtusa v. breviter acuminata, irregulariter et =fc grosse, basi saepe sinuato- v. 

 pinnatifido-dentata , dentibus interdum in petiolum descendentibus, sat moUia, ubique pilis 

 sat densis brevibus mollibusque obsita, mediocriter minuteque glandulosa; caulina 1 — 3, in- 

 ferius radicalibus interioribus simile, breviter petiolatum, superiora anguste lanceolata v. 

 bracteiformia. Acladium brevissimum v. ad 5 cm longum, rami primarii — 8 ( — 4) valde 

 remoti mono- (rarissime 2 — 3-) cephali, capitula 1—4 ( — 7). Involucrum 10 — 14 mm longum, 

 denique globoso-ovatum, squamae angustae ± longe acuminatae acutiusculae v. acutae, in- 

 timae acutissimae, omnes obscurae, sat dense pilosae, 2 — 3 mm, pilis basi atris apice canes- 

 centibus, et disperse tenuiterque glandulosae. Pedunculi canotomentosi mediocriter pilosi 

 disperseque glandulosi. Flores dilute lutei, ligulae apice subpilosae, stylus niger. 



Adhuc in Alpibus Helveticis tantum inventum et Sudetorum subspeciei nigrescens 

 respondens. — 1900—2200 (—2500) m. 



Variat: 1) normale Zahn, Hierac. d. Schw. (1906) p. 386. Folia pro maxima parte 

 oblongo-spathulata ± obtusaque. 



a) veruni Zahn 1. c. Involucrum 10 — 12 mm longum, ligulae evolutae. — 

 Helvetia occidentaHs: Ballacrete, FuIIy, Fointe de Savoleyres, La 

 Boellaire (Muret, Favrat, Wilczek), Aletschbord, Rieder Furka, Eggisch- 

 hom (Bernoulli, Wolf); Zermatt: Findelental, Staffel, Schwarzsee, Kiffel- 

 alp (Schleicher, Wolf); Saastal: Gletscheralp et WoUsgrube supra Saas- 

 Fee, Triftalp, Galen, Mattmark (Bernoulli, Muret); Arpitettaz pr. Zinal 

 (Bemoulli); in iugo Simplon, multis locis (Favrat, Chenevard); in vaile 

 Binn haud raro (Chenevard etc); in convallibus Miinstertal, Eginental, 

 Selkingertal, Tnitzital (Favrat, Wilczek); Gletsch, Maienwand, Grimsel 

 (Muret, Favrat); Furka, St. Gotthard (H. Christ, Bruegger); in Alpibus 

 Bernensibus: Schwabhorn, Bachalp, Kirchstuhl supra Meiringen 

 (Christener, BernouUi); Helvetia centraHs: Pilatus (Schinz); Helvetia 

 orientalis: Hiifialp, Graue Horner (Meli), Bevers (Muret); Helvetia 

 australis: Croce Pettano 2000 m, in alpe Quadrella 2150 ni, Cima di 

 Cagnone, Val d'Efra (Chenevard), Val d'Osola, Verzasca, Poncione del 

 Pulpito (Braun), Corte al Metto-Zotta (Chenevard). — Flora Valdostana: 

 inter Dondena et Laris valiis Camporcher (Vaccari). 



b) stylosum Favre et Zahn, Bull. herb. Boiss. (1903) p. 1132, ligulis tubulosis, 

 stylis longe exsertis. — Praecipue in iugo Simplon: Sirwolten etc. (Besse, 

 Favre). 



c) calvescens Zahn, Hierac. d. Schw. 1. c. Ubique brevius et minus dense 

 pilosum. — Simplon, Binntal, Kirchstuhl (Besse, Favrat, Beraoulli). 



looD. Fl. Germ. XIX, II. 23 



