Aylostera narvaecensis was first published, as Aylostera narvaecense, by M. Cárdenas in Cactus & Succulent Journal (US), 43(6): p.p. 245-7, in 1971.

The description is given here in the original Latin, plus my own English translation. You should look up the original for extensive further notes in English, plus some black-and-white photographs.

Aylostera narvaecense Card. sp. nov.

Globosa 3-3.5 cm. alta, 2.5-3.5 cm. crassa cinereo viridis aliquid apice depressa. Costis plusminusve 18, spiralis parva tuberculatis. Areolis 3-4mm. interse distantibus, circularis, prominentis albido tomentosis. Aculeis 10-20 gracilissime acicularis 2-5 mm. long, radiantibus. Flores numerosis ex lateralia pars caulorum, 4-4.2 cm. long., 4 cm. latis diluto roseo lilacinis. Ovario globoso 3 mm. diam., squamis minutis, pilis albis et setis radiantes praedito. Tubo 2.2 cm. long, gracilissimo, 2 mm. crasso, squamis minutis, pilis albis et setis brunescentis instructo. Phylla perigoni exteriora lanceolata 20 x 5 mm. temperato roseo lilacina. Phylla interiora lanceolata 21 x 5 mm. lucidiora colore quam phylla exteriora. Staminibus ex 1 cm. Supra fundo tubo usque basim petalia 7-10 mm. long.

Filamentis tenuissimis, albis; antheris diluto flavis. Stylo conferte tubo incluso 25 mm. long, albo, tenue, lobis stigmaticis diluto flavis 3 mm. long, coronato.

Patria Bolivia. Provinicia O’Conor. Departamento Tarija, prope Narvaez, 2,700 m.

English translation

Aylostera narvaecense Card. sp. nov.

Spherical, 3-3.5 cm high, 2.5-3.5 cm thick, greyish green, slightly depressed at apex. About 18 ribs, with low tubercules. Areoles 3-4 mm apart, circular, whitish felted, prominent.

No difference between radial and central spines, thin acicular, 10-20 or more, 2.5 mm long, spreading, whitish. Flowers numerous arising from the sides of the stem, 4-4.2 cm long, 4 cm limb, pale lilac-pink. Ovary spherical, 3 mm in diameter with minute scales bearing tufts of white hairs and spreading bristles. Tube 2.2 cm long, very narrow, 2 mm thick at its middle with minute scales provided with white hairs and brownish bristles. Outer petals lanceolate, 20 x 5 mm, light lilac-pink. Inner petals lanceolate, 21 x 5 mm, lighter in colour than outer petals. Stamens from 1 cm above the bottom of tube to the base of petals, 7-10 mm long. Filaments very thin, white; anthers light yellow. Style tightly surrounded by tube, 25 mm long, thin, white. Stigmas light yellow, 3 mm. long, radiating or deflexed.

Habitat: Narvaez, Department of Tarija, Province of O’Conor, Bolivia, at an altitude of 2,700 m.

October 1968, Anibal Corro. No. 6331 (Type in Herbarium Cardenasianum).