Zehntnerella Britton & Rose 1920
Publication : The Cactaceae (Britton & Rose) 2: 176 (1920).
Type : Zehntnerella squamulosa Britton & Rose, The Cactaceae (Britton & Rose) 2: 177, fig. 249, 250 (9 septembre 1920) = Cereus squamosus Gürke, Monatsschrift für Kakteenkunde 18: 70 (1908).
Description originale:
"35. ZEHNTNERELLA gen. nov.
Tall and slender, much branched at base; ribs numerous, very spiny; flowers scattered along the upper part of the stem, 1 from an areole, perhaps night-blooming, very small; tube short but definite, about the length of the throat; base of throat filled with a ring of long white hairs; inner perianth-segments minute, white; ovary and flower-tube covered with small scales, their axils filled with hairs; fruit small, globular; seeds minute, tuberculately roughened, brownish to blackish, with a large basal slightly depressed hilum.
Named for Dr. Leo Zehntner, formerly of the Horto Florestal, Joazeiro, Brazil, who has furnished us specimens and valuable information concerning many of the cacti from this region. It is a great pleasure to name a genus for this very keen observer, who has done such valuable work in Brazil, often under very trying circumstances. It is based upon a plant which Dr.Rose collected with him on the hills east of Joazeiro, Bahia, June 4, 1915 (No. 19760). Our plant may be the same as Cereus squamosus Gürke (Monatsschr. Kakteenk. 18: 70. 1908). A photograph of this species was reproduced (Bot. Jahrb. Engler 40: Beibl. 93: pl. 10) and this resembles Zehntnerella squamulosa, but the detailed description of Cereus squamosus does not wholly agree with it, and we have been unable to examine the type specimen of Cereus squamosus."
Sous-famille : Cactoideae
Tribu : Trichocereeae
Fiche créée le 27/08/2010, mise à jour le 28/08/2010.
Type : Zehntnerella squamulosa Britton & Rose, The Cactaceae (Britton & Rose) 2: 177, fig. 249, 250 (9 septembre 1920) = Cereus squamosus Gürke, Monatsschrift für Kakteenkunde 18: 70 (1908).
Description
Un genre maintenant inclus dans le genre Facheiroa et qui s’en distinguait par l’absence de céphalium. La découverte de Facheiroa cephaliomelana ssp. estevesii à céphalium superficiel, et pouvant même produire des fleurs d’aréoles non modifiées a permis de faire le lien entre les deux genres et a justifié leur rapprochement. Braun & Esteves estiment cependant que Zehntnerella doit être conservé comme sous-genre de Facheiroa (Revision der Gattung Facheiroa Britton & Rose, Kakteen und andere Sukkulenten 37(3): 56 (1986)).Description originale:
"35. ZEHNTNERELLA gen. nov.
Tall and slender, much branched at base; ribs numerous, very spiny; flowers scattered along the upper part of the stem, 1 from an areole, perhaps night-blooming, very small; tube short but definite, about the length of the throat; base of throat filled with a ring of long white hairs; inner perianth-segments minute, white; ovary and flower-tube covered with small scales, their axils filled with hairs; fruit small, globular; seeds minute, tuberculately roughened, brownish to blackish, with a large basal slightly depressed hilum.
Named for Dr. Leo Zehntner, formerly of the Horto Florestal, Joazeiro, Brazil, who has furnished us specimens and valuable information concerning many of the cacti from this region. It is a great pleasure to name a genus for this very keen observer, who has done such valuable work in Brazil, often under very trying circumstances. It is based upon a plant which Dr.Rose collected with him on the hills east of Joazeiro, Bahia, June 4, 1915 (No. 19760). Our plant may be the same as Cereus squamosus Gürke (Monatsschr. Kakteenk. 18: 70. 1908). A photograph of this species was reproduced (Bot. Jahrb. Engler 40: Beibl. 93: pl. 10) and this resembles Zehntnerella squamulosa, but the detailed description of Cereus squamosus does not wholly agree with it, and we have been unable to examine the type specimen of Cereus squamosus."
Classification
Famille : CactaceaeSous-famille : Cactoideae
Tribu : Trichocereeae
Étymologie
Zehntnerella: en l'honneur du naturaliste suisse Leo Zehntner (1864-1961).Répartition géographique
Brésil, nord et sud de Bahia (absent du centre, trop calcaire), sud-ouest de l'état de Pernambuco et sud-est de l'état de Piauí, en caatinga très rocailleuse ou sur inselbergs non calcaires, généralement granitiques ou gneissiques, entre 390 et 1020m d'altitude.Numéros de collecte
Vous pouvez chercher les numéros de collecte pour ce genre dans :- la base de Christophe Ludwig : Zehntnerella
Forum
Vous pouvez faire une recherche sur le forum.Auteur
philippe (contacter l'auteur ou écrire aux admins de l'encyclopédie)Fiche créée le 27/08/2010, mise à jour le 28/08/2010.
Fiches de botanistes :
Britton, Nathaniel Lord
Rose, Joseph Nelson
Fiches d'espèces :
Aucune.
Fiches de synonymes :
Zehntnerella arbusta nom.prov.