Ceratozamia hildae G. P. Landry & M. C. Wilson. Brittonia 31(3): 422-424. 1979.

Martinez-Dominguez, Lili, Nicolalde-Morejon, Fernando, Vergara-Silva, Francisco & Stevenson, Dennis Wm., 2018, Taxonomic review of Ceratozamia (Zamiaceae) in the Sierra Madre Oriental, Mexico, PhytoKeys 100, pp. 91-124 : 100-102

6. Ceratozamia hildae G. P. Landry & M. C. Wilson. Brittonia 31(3): 422-424. 1979. Figures 4A , 7B

Type.

Louisiana , Baton Rouge , cultivated at 5988 South Pollard Parkway (originally from several km N of Xilitla, San Luis Potosí, Mexico), Landry G 76521 (holotype: GH; isotypes: FTG, LSU, MEXU, MICH, NY, US) .

Description.

Stem semi-epigeous, erect, 10-20 cm in length, 10-15 cm in diameter. Cataphylls persistent, densely tomentose at emergence, reddish-brown and partially tomentose at maturity, triangular, apex acuminate, 2.1-3 × 0.8-1.5 cm at base. Leaves 2-7, ascending, 95-202 cm, reddish-brown at emergence with whitish-grey pubescence, glabrous at maturity. Petiole terete, straight, 43-89 cm, armed with thin and short prickles, greenish-brown and green in adult leaves. Rachis terete, straight, 60-130 cm, armed with prickles and occasionally unarmed, greenish-brown in adult leaves. Leaflets with 5-11 fascicles, 16-56 leaflets in total, oblong, mostly planar, basally falcate to non-basally falcate, membranaceous, flat, clustered, plane, green, adaxial and abaxial side glaucous, acuminate apex, symmetric and asymmetric apex, attenuate at base, with conspicuous and light green veins; median leaflets 14.5-24 × 2.4-5 cm, 6-15 cm between leaflets; articulations brown and green, 0.2-0.5 cm wide. Polliniferous strobilus solitary, cylindrical, erect, 8-10 cm in length, 2-2.5 cm in diameter, brown with reddish-brown pubescence at emergence, reddish-brown at maturity; peduncle tomentose, reddish-brown to brown, 6-7.5 cm in length, 0.9-1 cm in diameter; microsporophylls 0.8-1.2 × 0.6-0.9 cm, non-recurved distal face. Ovuliferous strobilus solitary, cylindrical, erect, 10-14 cm in length, 6-9 cm in diameter, green at emergence with brown trichomes, green with brown to blackish trichomes at maturity, acuminate apex; peduncle tomentose, brown, 5-6 cm in length, 1.2-1.5 cm in diameter; megasporophylls 36-77, 2-3.7 × 2-4 cm, prominent distal face, right angle between horns. Seeds ovoid, sarcotesta whitish-red when immature, light brown at maturity, 1.3-2.3 cm in length, 1.2-1.5 cm in diameter.

Distribution and habitat.

Endemic to Mexico in San Luis Potosí (Fig. 9 ), in the evergreen tropical forests.

Etymology.

The epithet is in honour of Hilda Guerra Walker, daughter of the original collector.

Distinguishing features.

Ceratozamia hildae differs from its congeners by its clustered leaflets. Besides, leaflets are membranaceous and oblong.

Specimens examined.

MEXICO. Querétaro: Jalpan de Serra , A. P. Vovides 337 (XAL), A. P. Vovides s/n (IEB), B. Servin 870, 986 (MEXU), 6328, 6330 (IEB), J. Rees s/n (IEB), 312 (XAL) . San Luis Potosí: Aquismón, A. P. Vovides & J. Rees 312 (MEXU, XAL), F. Nicolalde-Morejón et al. 2391-2406 (CIB), L. Martínez-Domínguez et al. 910-923 (CIB), S. Longoria s/n (XAL), T. W. Walters TW-2001-14-A (MEXU, XAL), TW-2001-14-B (XAL), TW-2001-14-C (MEXU) .

Figures

Figure 4. Types of leaves and leaflets. A Linear petiole and rachis with clustered leaflets B Twisted petioles and rachis, with opposite to subopposite leaflets.

Figure 7. Shapes of polliniferous strobilus. A Ceratozamia sabatoi B C. hildae C C. kuesteriana.

Figure 9. Distribution map of Ceratozamia sabatoi, C. latifolia, C. zaragozae, C. kuesteriana, C. hildae, C. fuscoviridis and C. chamberlainii.