Chamaecereus silvestrii Spegazzini
Cereus silvestrii Spegazzini, Anal. Mus. Nac. Buenos Aires 111. 4: 483. 1905.
Joints usually prostrate, sometimes 4 to 6 cm. high, pale green; ribs about 6 to 9, but usually 8, low; spines soft, white; flowers orange-scarlet, about 7 cm. long, the axils of the scales bearing long black and white hairs and a few bristles; flower-tube narrow, 2.5 to 3 cm. long; perianth-segments in 3 or 4 series, spreading, 1 to 2 cm. long, 4 mm. broad, lanceolate, the outer ones acute, the inner shorter and obtuse; filaments red to purple, short; style pale yellow to greenish white, longer than the stamens; stigma-lobes 8 or 9, connivent.
Type locality: Mountains between Tucuman and Salta, Argentina.
Distribution: Tucuman, Argentina.
This plant resembles in habit some of the creeping species of Echinocereus, but has very different flowers; it has no close relatives in Argentina; it is largely grown in European collections, where it is highly prized. Dr. Rose obtained specimens in Argentina in 1915, but so far none has flowered.
This species was named for Dr. Philip Silvestri, a friend of Dr. Spegazzini. Illustrations: Curtis's Bot. Mag. 138: pl. 8426; Gartenwelt 15: 484; Haage and Schmidt, Haupt-Verz. 1919: 167, as Cereus silvestrii.
Figure 61 is from a photograph contributed by Dr. Spegazzini in 1915.
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