Desmopsis guerrerensis Gonz.-Martínez

Schatz, G. E., Maas, P. J. M., Kamer, H. Maas-van de, Westra, L. Y. T. & Wieringa, J. J., 2018, Revision of the Neotropical genus Desmopsis (Annonaceae), Blumea 63 (1), pp. 67-86 : 75-76

9. Desmopsis guerrerensis Gonz.-Martínez & J. Jiménez Ram. — Map 6

Desmopsis guerrerensis Gonz.-Martínez & J. Jiménez Ram. in Jiménez-Ramírez & González-Martínez (2016) 51. — Type: C.A. González­Martínez & S. Rios­Carrasco 892 (holo FCME; iso FCME, NY), Mexico, Guerrero, Mun. Chilpancingo de los Bravo , Acahuizotla , en ladera cerca de rio, 20 Feb. 2015.

Tree 3–4 m tall, diam not recorded; young twigs covered with appressed, yellow hairs or glabrescent. Leaves: petiole 3–7 mm long, 1 mm diam, sparsely to moderately covered with appressed hairs or glabrescent; lamina elliptic, (3.6–)4.5–13.5 by (1.6–) 2–4.5 cm, chartaceous to membranous, glabrous above, sparsely covered with appressed hairs or glabrescent below and with evident oil bodies (glands), non-verrucose, base cuneate to obtuse, apex acuminate (acumen to 20 mm long), the extreme tip slightly rounded, primary vein impressed above, glabrous, raised below, sparsely covered with appressed hairs, secondary veins 8–11 on either side of primary vein, flat above, slightly raised below, tertiary veins flat above, slightly raised below, reticulate. Inflorescence and flower indument: pedicels and outer side of bracts, outer side of sepals, and outer side of petals sparsely to densely covered with appressed yellowish to white hairs. Inflorescences 1-flowered, sub-leaf-opposed or terminal; pedicels 26–43 mm long, elongating to 44–51 mm in fruit, 0.5–1.3 mm diam; basal bracts 1 or 2, leafy, ovate, 14–17(–20) by 9–13 mm, base cordate to obtuse, apex acute, sometimes soon falling off, upper bract scale-like, 1.25–2 mm long, lanceo- late; sepals ovate, 3–4 by 3–3.2 mm at anthesis, accrescent and persistent in fruit, (5–)7–9 by 5–6.5(–7) mm; petals green, subequal, ovate to narrowly ovate, 5.5–10.7 by 2.7–3.3 mm, the margin sometimes revolute, the apex incurved. Monocarps 5–10, red at maturity, subspherical to ovoid, 8–17 mm long, 8–15 mm diam, sparsely covered with appressed white hairs near the base, base and apex rounded, not constricted between the seeds upon drying, wall 0.4–0.5 mm thick, stipes 6–8 mm long, c. 1.5 mm diam. Seeds 2 or 3, in one row, discoid or hemispherical, 9–10.5 by 2–5.5 mm, finely grooved.

Distribution — Mexico.

Habitat & Ecology — Semi-deciduous forest. At elevations of c. 800 m. Flowering: February; fruiting: March.

Vernacular names — Not recorded.

Note — Desmopsis guerrerensis is recognized by its leaves with evident glandular oil bodies on the upper and lower surface, a leafy lower bract on the pedicel, persistent and accrescent sepals in fruit, and subspherical to ovoid monocarps with 2 or 3 seeds.

Figures

Map 6 Distribution of Desmopsis lanceolata Lundell (t), D. guerrerensis González-Martínez & Jiménez-Ramírez (▲), D. mexicana R.E.Fr. (■) and D. subnuda (R.E.Fr.) G.E.Schatz & Maas (●).