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Monographia Aquifoliacearum - Loizeau Pierre-André & Gabrielle Barriera


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Aquifoliaceae of Neotropics

Loizeau P.-A. & G. Barriera


Ilex steyermarkii Edwin

Habit, vegetative morphology.— Tree, evergreen, 4.5–6 m tall. Current year's branchlets glabrous (parfois poils très courts visibles à la loupe binocuaire). Branchlets older than one year smooth or furrowed, reddish, glabrous. Lenticels on current year's branchlets present. Internodes 0.1–2 cm. Stipules caducous, linear-triangular, 0.5 mm. Petiole glabrous (poils longs noirs...), rough or grooved surface, 5–7 mm. Lamina elliptic, oblong (1:2), 2.5–5.5 X, 1–2.7 cm, coriaceous, glabrous abaxially. Base cuneate or acute. Apex obtuse or acute. Apex retuse or rounded or acuminate (brièvement). Acumen 0.1 cm. Margin revolute, entire. Midbrid adaxially impressed, glabrous. Midbrid abaxially raised, glabrous. Secondary veins abaxially evident, 4–6 pairs. Tertiary veins abaxially obscure. Ponctuation abaxiallly present (ponctuation plutôt absente selon Steyermark & Berry 1995).

Inflorescences.— Thyrse, proliferating.

Female flowers.— Thyrses axes solitary and axillary. Thyrses axes 0.5–10 cm. Cymes of order 1–2. Peduncles glabrous (poils bruns foncés). Peduncles of order 1 5–15 mm. Pherophylls of order 1 at 2–3 tenth of the base or 7–8 tenth of the base. Peduncles of order 2 2–3 mm. Pherophylls of order 2 at 0–1 tenth of the base. Bracts linear-triangulate, glabrous, 1 mm, margin entire. Pherophylls of order 1 opposite or subopposite, linear-triangulate, glabrous, 0.5 mm, margin entire. Female flowers 4–5 -merous. Calyx glabrous, margin entire, 2–2.5 mm in diam.

Fruits.— Fruit spherical, 5–6 mm in diam., 5–6 mm.

Distribution, ecology.— South America, Venezuela (Bolívar: (Auyán-tepui, Gran Sabana, Macizo del Chimantá (Toronó-tepui))), 800–1700 m, Submontane and montane forests at base of sandstone escarpments.

Illustrations.— • Dessin in Berry & al. (1995). Flora of the Venezuelan Guayana. • Planche Steyermark 75501 K=WIS f (IT). • Planche Steyermark 75501 MO. • Etiquette Steyermark 75501 MO. • Fruit Steyermark 75501 MO. • Rameau Steyermark 75501 MO. • Feuilles Steyermark 75501 MO. • Planche Steyermark 75501 NY.


Cite this publication as: ‘Loizeau, P.-A. & G. Barriera (2007). Aquifoliaceae néotropicales: Descriptions, Illustrations, Identification, et Recherche d'Information. Version: 1st march 2007. http://www.ville-ge.ch/cjb/.
Loizeau (1994) et Loizeau & Spichiger (1992) should also be cited (see Bibliography).