Xerophyte

Central Spines

One, pointed toward the stems tip, slightly flattened, dark reddish, up to 10 mm long.

Description

The peculiarity of E. waldeisii is that it forms only a single stem, that can branch out in the age, but not in the same extent as the similar species Echinocereus tamaulipensisSN|8563]]. The stems are clambering through the adjacent vegetation and arise from a tuberous, dahlia-like root-stock.

Taxonomy

Hunt et al. 2006 treats E. waldeisii as a synonym of Echinocereus tamaulipensisSN|8563]], however, Hernández et al. 2004 treat it as a good species.

Flowers

Terminal or borne near the tips of older stems, narrowly funnelform that often fail to open completely, up to 6cm long and 4 cm in diameter.

Ribs

Flat, without tubercles.

Stem

Slender cylindrical, with pointed growing tips, dark blue-green to purplish o brownish 60-120 cm long about 2 cm in diameter.

Radial Spines

8-16, thin, bristle-like, whitish or grayish, with dark tips, up to 5mm long.

Fruits

Ovoid, dark green to brown, indehisent, with persistent spines and wool.