Cardenas. - "Cactus" (Paris), 19-82, 51-52.1964
Info from Backeberg’s Lexicon
Reduced to synonymy under L. ianthothele by Barthlott and Taylor Bradleya
13. now Pfeiffera
Shoots thin, rounded, to 25 cm long., pale green, to 1 cm diam;
Ribs. about 7, tuberculate;
Areoles. to 7 mm apart, round, prominent, pale brown;
Spines. acicular, very thin, 6 - 7, 3-10 mm long., pale brown;
Central spine. occasionally 1;
Flowers. apical, 1.5 cm long., white;
Petals. ca. 9;
Fruit. spherical, pale yellow, c. 1 cm diam, watery;
Seeds. 1.2 mm long., glossy, black.
Habitat - Bolivia (Prov. Azero, Dept. Chuquisaca, road from Monteagudo
to Camiri, 1100 m). An interesting species, clearly differentiated by
its subterete and finely tuberculate shoots.
Ritter also mentions the following newly named species: P. gibberosperma
Ritt.; P. gracilis Ritt., “ very slender, with many ribs and thin
spines"; P. tarijensis Ritt., “weakly spined", ribs.
fairly low (FR 880).