Rebutia steinmannii Solms Laubach

Echinocactus steinmannii Solms-Laubach, Bot. Zeit. 651: 133. 1907.

Small oblong plants (about 2 cm. high) 1 to 1.5 cm. in diameter; ribs low, often spiraled, tubercled; spines acicular, about 8; flowers from the side of the plant, erect, campanulate; outer perianth-segments oblong, apiculate; inner perianth-segments rounded.

Type locality: High mountains of Bolivia.

Distribution: Known only from the type locality.

This very strange plant is unknown to us except from the description and illustrations, but it seems to be of this relationship.

Illustrations: Bot. Zeit. 651: pl. 2, f. 4, 10, as Echinocactus steinmannii.

Figure 6oa is from a photograph of the illustrations cited above.

DESCRIBED SPECIES, PERHAPS OF THIS GENUS. Echinopsis deminuta Weber, Bull. Mus. Hist. Nat. Paris 10: 386. 1904.

Echinocactus deminutus Gurke, Monatsschr. Kakteenk. 16: 103. 1906.

Plants globular to short-cylindric, 5 to 6 cm. high; ribs 11 to 13, somewhat spiraled, more or less tuberculate; spines numerous, somewhat rigid; flowers 3 cm. long, with a limb 3 cm. broad; outer perianth-segments lanceolate, purple, 4 to 5 mm. long; inner perianth-segments 15, red to orange, 5 to 6 mm. long; ovary bristly, 6 mm. in diameter; stigma-lobes white.

Type locality: Trancas, Argentina.

Distribution: Known only from the type locality.

We append the description of this plant to our genus Rebutia, to which it may belong, but we have not been able to study any specimens of it. Weber's reference of the species to Echinopsis certainly is erroneous, nor is it an Echinocactus in our understanding of that genus.

4. CHAMAECEREUS gen. nov.

Plants small, usually creeping and forming little clumps, sometimes some of the joints pendent, usually arising f rom the base, cylindric, with a few low ribs; spines acicular; flowers diurnal, solitary at the areoles, comparatively small, erect; tube cylindric, bearing acute scales with hairy axils; inner perianth-segments spreading, scarlet; stamens included; fruit small, globular, dry or nearly so, bearing long woolly hairs; seeds black, opaque, punctate.

Type species: Cereus silvestrii Spegazzini.

Only one species is known, inhabiting Argentina.

We are indebted to Mr. Alwin Berger for notes upon this interesting plant which have been freely used in our description.

The first part of the generic name is from ca^ai on the ground, referring to the creeping or depressed habit of the plant.

Continue reading here: Chamaecereus silvestrii Spegazzini

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