Description:
The peculiarity of
Echinocereus 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 E.
tamaulipensis. The stems are clambering through the adjacent
vegetation and arise from a tuberous, dahlia-like root-stock.
Stem: Slender cylindrical, with pointed growing tips, dark
blue-green to purplish o brownish 60-120 cm long about 2 cm in diameter.
Ribs: Flat, without tubercles.
Central spine: One, pointed toward the stems tip, slightly
flattened, dark reddish, up to 10 mm long.
Radial spines: 8-16, thin, bristle-like, whitish or grayish, with
dark tips, up to 5mm long.
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.
Fruit: ovoid, dark green to brown, indehisent, with persistent
spines and wool.
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