Neobuxbaumia tetetzo, also illustrated on page 17

Neolloydia is one of several genera that were less well defined by Nathaniel Britton and Joseph Rose (1919-1923,4:14-18) in The Cactaceae. The name honors Francis E. Lloyd, a botanist who contributed to Britton and Rose's study of cacti, prefixed neo, new, because Lloydia had previously been used for a lily. Several of the species that Britton and Rose placed in Neolloydia had been included in Mammillaria by Karl Schumann (1897-1898). Within a few years they described several more genera consisting of closely related species. They distinguished Neolloydia as having tubercles with furrows, the flowers not borne at the spine areoles, the ovary naked or nearly so, and the fruits fleshy and indehiscent.

480 Neo/loydia

The poorly defined boundaries of Neolloydia led to more than 30 taxa being included in it at one time or another, from such diverse genera as Coryphantha, Echinomastus, Escobaría, Mammillaria, Sclerocactus, Thelocactus, and Turbini-carpus. In my revision of the genus (Anderson 1986) I proposed that those taxa that had been included in Gymno-cactus, Normanbokea, and Turbinicarpus be included with N. conoidea, the type species of Neolloydia. The International Cactaceae Systematics Group did not adopt this proposal, however, preferring to retain a more broadly defined Turbinicarpus, containing all the species I had put in Neolloydia with the exception of N. conoidea and another species, N. matehualensis, which I considered to be simply a variant of N. conoidea (Zimmerman 1991, Hunt 1999a). The treatment here follows that of the group, however, recognizing two species, flowering in spring and summer.

Neolloydia Britton & Rose 1922

Subfamily Cactoideae, tribe Cacteae. Plants small, low growing, solitary or loosely clustering. Stems globose cylindrical, somewhat yellowish green, usually with white woolly tips, 5-24 cm (2-9.4 in) high, 3-6 cm (1.2-2.4 in) in diameter. Ribs poorly developed or absent. Tubercles well developed, conical, 3-10 mm (to 0.4 in) long, 6-10 mm (0.2-0.4 in) broad, 5-9 mm (0.2-0.4 in) high. Areoles di morphic, 3-5 mm in diameter, 8-12 mm (0.3-0.5 in) apart, with an areolar groove. Central spines variable, 1-2, rarely as many as 6, sometimes absent, black to reddish brown, straight, erect, 5-25 mm (0.2-1 in) long. Radial spines 10-25, all white or whitish with a dark tip, radiating, straight, 5-7 mm (0.2-0.3 in) long. Flowers arisingfrom the base of the areolar groove of young tubercles, funnelform, fairly small, magenta, 2-3 cm (0.8-1.2 in) long, 4-6 cm (1.6-2.4 in) in diameter; pericarpels naked. Fruits round, green, becoming greenish brown, fleshy at first but becoming dry at maturity, naked, indehiscent, 4-5 mm in diameter. Seeds black, pear shaped, tuberculate, with an uneven lip over part of the hilum, 1-1.5 mm long. Distribution: west Texas south throughout the Chihuahuan Desert of northern Mexico, into Queretaro.

Neolloydia conoidea (A. P. de Candolle) Britton & Rose 1923 TEXAS CONE CACTUS

Mammillaria conoidea A. P. de Candolle 1828, Echinocactus conoideus (A. P. de Candolle) Poselger 1853, Coryphantha conoidea (A. P. de Candolle) Orcutt ex A. Berger 1929, Pediocactus conoideus (A. P. de Candolle) Halda 1998 Neolloydia ceratites (Quehl) Britton & Rose 1923 Neolloydia texensis Britton & Rose 1923 Neolloydia grandiflora (Otto ex Pfeiffer) F. M. Knuth 1935

Plants yellowish green to green. Central spine usually one, sometimes absent, erect. Radial spines 15-16. Distribution: widely ranging, west Texas south throughout northern Mexico into Queretaro.

Neolloydia matehualensis Backeberg 1948

Plant body whitish green. Central spines usually 2, more or less erect. Radial spines 10. Distribution: Chihuahuan Desert

Neolloydia Conoidea

Neolloydia matehualensis

Neolloydia conoidea south of Matehuala, San Luis Potosí, Mexico. Neolloydia ma-tehualensis is uncommon, occurring only in a restricted area within the large range of N. conoidea. Neolloydia conoidea is extremely variable throughout its range (Anderson 1986) and I question whether N. matehualensis is, indeed, worthy of recognition at the level of species.

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