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| The genera of Cactaceae |
~ Samaipaticereus
The plants cerioid; not ‘low and very compacted’. The stems spiny; elongate cylindric; 6–7 cm in diameter; neither cephaliate nor pseudocephaliate. The plants branched; erect; shrubby to tree-like; to 4–5 m high. The stems columnar. The branches resembling the main stem; cylindrical; 6–7 cm in diameter. The stems not segmented; ribbed and grooved. The ribs 6–10; longitudinal; straight, to 1 cm high, obtuse. The grooves wide. The plants not conspicuously tuberculate (the ribs not horizontally notched, but slightly thickened around the areoles). The areoles not tubercle-associated; distant; borne in longitudinal series; simple; with spines. The spines clustered; 4–12; 1.5–3 cm long; showing little or no difference between radials and centrals; stiff; straight; terete (acicular); brownish to grey. The mature stems leafless.
Flowering at night and during the day. The flowers lateral (5–8, borne towards the stem tips); one per areole; narrowly funnelform; sessile; medium-sized; 5–6 cm long; regular to somewhat irregular (slightly bilaterally symmetrical). The receptacle conspicuously produced beyond the ovary into a tubular hypanthium. The hypanthial tube stout; not naked; without scales; with short clusters of hairs only, spineless (no bristles). The perianth white.
The mature fruit 2–2.8 cm long. The seeds not encased in bony arils; without a mucilage sheath. Cotyledons reduced or vestigial.
Natural Distribution. Bolivia, at about 2000 m.
Classification. 1 species (Y. inquisivensis). Subfamily Cactoideae. Tribe Trichocereeae.
We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa. See also Guidelines for using data taken from Web publications.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2018 onwards. The genera of Cactaceae: descriptions, illustrations, identification, and information retrieval. Version: 14th November 2021. delta-intkey.com’.