Ceratozamia latifolia Miq.

Ceratozamia latifolia Miq., Tijdschr. Wis- Natuurk. Wetensch. Eerste Kl. Kon. Ned. Inst. Wetensch. 1(1): 206. (1847)

Neotype. MEXICO, San Luis Potosí: Route 70, 46 k West of [Ciudad] Valles, 20 Jul 1983, Stevenson 565E (Neotype: NY).

= Ceratozamia microstrobila Vovides & Rees. Madroño 30(1): 39–42. (1983).

MEXICO, San Luis Potosí: Municipio of Ciudad del Maíz, at Ejido las Abritas, 850 m, 1974, J. Rees 1613 (MO, XAL).

Plant rupicolous, unbranching. Stem short semihypogeous, ovoid-cylindrical, erect, sometimes, covered with persistent leaf bases, 8–10 cm tall, 10–12 cm in diameter. Cataphylls persistent, brown and densely tomentose at emergence, triangular apex acuminate. Leaves pinnate, 2–6 per crown, forming a open crown, erect, ascending, olive green, 60– 219 cm long, 19.8–56.2 cm wide, reddish-brown color at emergence, turning olive green at maturity. Petiole, terete, greenish-light brown, 14.5–62 cm long, unarmed to rarely armed with thin, tiny and spread prickles. Rachis greenishbrown, terete, 42–161 cm long, unarmed or rarely with thin, tiny and sparse prickles diminishing into the distal end of the rachis. Leaflets 7–20 pairs, oblong or long oblanceolate, papyraceous, subopposite to alternate in the basal part of the leaf, opposite to subopposite in the median part, opposite in the apical part, margin entire, apex acute to acuminate, asymmetric; base broad attenuate, articulation green or brown adaxially, light green abaxially 0.33–1.09 cm wide, veins 32–46, parallel, inconspicuous; median leaflets 9.9–28.1 cm long, 2.5–4.9 cm wide, spaced 1.9–7.5 cm between leaflets. Microstrobilus solitary, conical, erect, green to brown, tomentose, 17–18 cm long, 2.2–2.6 cm diameter, peduncle brown, densely tomentose, 8–10 cm long, 0.8–1.2 cm diameter. Microsporophyll cuneiform, 8.10– 10.70 mm long, 4.36–5.79 mm wide, distal face bicornate, with brown color at the central portion, sporangia zone on abaxial surface 4.58–7.82 mm long, microsporangia grouped in 3–4 per sorus. Megastrobilus solitary, cylindrical, erect, 8–13.5 cm long, 5.7–5.9 cm diameter; apex mucronate, light brown pubescent at mature, peduncle long, brown to orange, tomentose, 6.5–10 cm long, 0.78–1.25 cm in diameter. Megasporophylls peltate, bicornate, 2.3–3.9 cm wide, 1.4–1.8 cm tall, distal face pubescent, when mature, distal face presents a brown color at the central portion, which fades to green to brown towards the margins. Seed ovoid, sarcotesta cream when immature, sclerotesta beige when mature, 1.12–1.53 cm diameter, 1.21–1.68 cm long, with micropylar ridges.

Specimens examined: MEXICO, San Luis Potosí: Ciudad de Maíz, 1100 m, 25 Apr 2001, S. Avendaño & M.A. Pérez Farrera 5320 (MEXU); 850 m, 2 August 2021, M.A. Pérez-Farrera et al. 4026 (HEM); 750 m, 13 Oct 1968, Puig 3979 (P); 850 m, 7 Nov 1974, J. Rees 1613 (MO, XAL); 1100 m, 5 Feb 1984, S. Sabato et al. 2340 (MEXU, MO); El Naranjo, 800 m, 13 Jun 2008; 1611 (XAL); 910 m, 20 Jul. 1983, D.W. Stevenson et al. 567 (MEXU); 895 m, 14 Jan 2001, T. Walters 2001-10 (MEXU); Rayón, 1100 m, 30 Jun 1962, F. Medellín Leal 1330 (MEXU); M.A. PérezFarrera et al. 4027 (HEM); 912 m, 5 Aug. 2003 Andrew P. Vovides 1466 (XAL); Tamasopo, 1000 m, 24 April 2001, S. Avendaño & M.A. Pérez-Farrera 5282 (MEXU); 900 m, 24 May 1981, P.A. Fryxell & W.R. Anderson 3586 (MEXU); 2 Jun 1968, Medellín Leal s.n. (MEXU accession 171861); 180 m, 01 August 2021, M.A. Pérez-Farrera 4023 (HEM); 20 July 1983, D.W. Stevenson et al. 565A; 565B; 565C; 565D; 565G; 567K (MEXU); 700 m, 15 Aug 2003, A.P. Vovides et al. 1465 (MEXU, XAL); 895 m, 13 Jan 2001, T. Walters et al. 2001-8 (XAL).