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Haec species notabilis ab omnibus Dorstenia speciebus differt ob filicinu lithophitu habitu novu familae
The Democratic Republic of Congo, Katanga Province, Tumbwe Sector, Luama Wildlife Reserve, M.E. Leal 2551 (holo LWI, iso BR), S5°14,526', E 28° 52,215', 1176m, 31 October 2012.
Lithophytes 10–17 cm long with a tuber 0.5 cm; stems aerial, hanging, glabrous; internodes 2.5–3 cm long; no white latex or translucent exudate. Stipules absent or deciduous without scars. Leaves distichous; blade narrowly subfalcate 5–7 × 1–1.4 cm, membranaceous, apex micrunate, base cunate, adaxial side glabrous and subspiculate, abaxial side white and glabrous; margins entire; petiole 1–2 mm long; venation brochidodromous; 5–7 pairs of secondary veins; tertiary veins scalariform. Receptacle elliptic to round, 3–4 mm in diameter, patelliform; margin greenish with triangular lobes (1 mm) and subspathulate appendages, 2–3 mm long; peduncle 1 mm long, glabrous. Staminate and pistilate flowers (7 to 8) tightly packed in receptacle: perianth short lobed, whit apex minutely 2–3 lobed, glabrous; stigma 0.1 mm long. Drupes and seeds are unknown.
Distinction from other species
This new species can be distinguished from any other Dorstenia species by its fernlike habit, hanging from vertical rock faces and the absence of latex.
The new species is added to the existing key of Berg and Hijman (1999) the “key to succulent and semi-succulent species of the Old World”
The specimens were collected in late October.
Dorstenia luamensis M.E.Leal inhabits moist and shady vertical rock faces close to small waterfalls in forest within a riverine forest-open woodland-savanna mosaic.
Distribution and conservation status
The species is distributed in small populations within the type locality, and according to these demographic characteristics it merits the conservation status of endangered (EN).
The epithet luamensis refers the Luama Wildlife Reserve which is drained by the Luama River.
- Leal, M; 2014: Dorstenia luamensis (Moraceae), a new species from eastern Democratic Republic of Congo PhytoKeys, (42): 49-55. doi