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Les Hieracium des Alpes françaises ou occidentales de l'Europe

[article]

Fait partie d'un numéro thématique : Année 1887
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Page 1

LES HIERAGIUM

DES

ALPES FRANÇAISES

o

ou

OCCIDENTALES DE L'EUROPE

PAR

C. ARVET-TOUVET

Présenté à la Société linnéenne de Lyon, le 2S mars 1887.

" ---— --—<•<>> -----: j

Hieracium, L., Tausch, Fries. — Épervière

Péricline à écailles imbriquées ou sur deux rangs; réceptacle nu, alvéolé; alvéoles plus ou moins saillants, à bords entiers, denticulés, dentés ou même laciniés-fibrilleux et parfois en même temps brièvement poilus-ciliés; achènes subcolumnaires, cylindriques, striés, tronqués au sommet et dépourvus de bec; aigrette sessile, unisériée ou subbisériée, roussâtre ou blanchâtre (parfois d'un blanc de neige, dans le sous-genre StônothecaJ, à poils simples, raides, fragiles. Plantes herbacées, péren-nantes.

Sous-genre. — Stenotheca, Fries

Péricline à écailles sur deux rangs, les extérieures très courtes, en forme de calycule. les intérieures linéaires-allongées ; achènes terminés au sommet par un bourrelet non crénelé; aigrette unisériée.

Section 1. — Tolpidiformia, DC

Aigrette blanche, peu fragile ; achènes atténués vers la basef

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