Gattung Pachycereus
(Berger pro subgen.) Britton et Rose emend. F. Buxbaum in Die Entwicklungslinien d.
Tribus Pachycereae F. Buxb. (Cactaceae‑Cereoideae), Botanische Studien, Heft 12, Jena 1961.

Cereus subgen. Pachycereus Berger in Reports of the Missouri Bot. Gardens 16, 1905, S. 63.
— Pachycereus Britton et Rose in Contrib. U. S. National Herbarium 12. 1909, S. 420. — Le­
maireocereus Britton et Rose in Contrib. U. S. National Herbarium 12. 1909, S. 424.

gr. „pachys“ = dick; der Name bezieht sich auf die außerordentliche Dicke dieser Riesencereen.

U.‑Fam. C. Cereoideae, Trib. III. Pachycereae, Subtrib. b. Pachycereinae.



Diagnosen

1. Nach A. Berger pro subgen. l. c.:

„Ovary ovate to globose, densely covered with small imbricated scales and woolly hairs and
bristles; petaloid perianth leaves short, spatulate, little expanded; stamens numerous, inserted
along the tube; style not exserted. Fruit globose, densely covered with wool and numerous long
thin bristles.“



2. Nach Britton und Rose l. c.:

“Usually very large plants, more or less branched from a def inite trunk; flowers diurnal (?),
with a rather short tube; petals short, spatulate; stamens included, numerous, inserted along the
throat; style included; ovary and tube covered with small bracts and woolly hairs and bristles;
fruit large, bur‑like, dry, densely covered with clusters of deciduous spines and bristles; seeds
large and black.“



3. Emendierte Diagnose nach Buxbaum l. c.:

“Arbores columnares ingentes supra truncum distinctum candelabriformiter ramosae, costis
Multis, areolis saepe connatis.
Flores prope apicem vel ex partibus veteribus ramorum orientes, singuli, permagni; pericarpel­
lo crasso in receptaculum crassum cylindricum, ad faucem vix dilatatum transeunte; pericarpello
receptaculoque squamis permultis, minimis vel conspicuis, faucem versus auctis, instructis; axillis
omnium squamarum areolam permagnam lanuginosam, plerumque pilosissi am atque setosam
m
gerentibus; camera nectanifera aperta, magna sed angusta, basi pistillo crasso occlusa; staminibus
inf imis non incrassatis, aequa altitudine orientibus, vix vel non excedentibus; ceteris permultis
densissime usque ad faucem positis, paulatim faucem versus brevioribus; pistillo crasso stigmatis
partibus multis, linearibus inaequaliter insertis.
Fructus magnus areolis magnis lanuginosis atque ± densissime setaceo‑spinosis instructus,
irregulariter dehiscens, primum ± carnosus brevi tempore siccans vel rarius succosus.
Semina permagna nigra, laeviter‑nitida, galeaeformia, hili parte vix excedente, hilo basali
testae margine angusto circumdato, vix depresso; embryone succulentissimo, redunco, cotyledonibus
magnis. Blastus hypocotylo brevi, cotyledonibus permagnis, crassis triangularibus.“

Leitart: Pachycereus pringlei (S. Watson) Britton et Rose (Cereus pringlei S. Watson in Pro‑
ceed. Acad. 1885, S. 389.)




Krainz, Die Kakteen, 15. IV. 1963 C III b