Ulearum Engl.
  • Bot. Jahrb. Syst. 37: 95 (1905) 

Notes: Distribution: Peru to N. Brazil

General Description

Laticifers anastomosing. HABIT : small evergreen herbs, rhizome creeping horizontally just below the soil surface. LEAVES : 1-several, 1 marcescent cataphyll enclosing base of petiole. PETIOLE : sheath very short. BLADE : subreniform to broadly sagittate, often variegated; primary lateral veins arising from petiole insertion, forming a submarginal collective vein, 1-2 marginal veins also present, higher order venation reticulate. INFLORESCENCE : solitary. PEDUNCLE : slender, subequal to or longer than petiole, base enclosed by a single relatively long cataphyll. SPATHE : oblong-lanceolate, greenish, unconstricted, completely expanded, margins revolute, persistent and dark green in fruit. SPADIX : slender, subequal to spathe, female zone adnate to spathe, separated from male zone by a longer sterile zone, lower part of sterile zone naked or only sparsely covered with sterile flowers, upper part with short dense zone of staminodes, male zone short, composed of 6-7 whorls of stamens, terminal appendix digitiform, base composed of a few whorls of apically rounded staminodes, becoming smooth above. FLOWERS : unisexual, perigone absent. MALE FLOWER : apparently 1-androus, stamens sessile, subtruncate, connective ± broad, thecae ellipsoid to globose, dehiscing by apical pore. POLLEN : inaperturate, spherical, medium-sized (diam. 26-32 µm.), exine spinose. STERILE FLOWERS : depressed globose or cylindric; staminodes below male zone in 2-3 whorls, rounded apically. FEMALE FLOWER : gynoecium narrowly subcylindric, ovary 1-locular, ovule 1, anatropous, funicle short, placenta basal, style ± as thick as ovary, stigma discoid, as broad as style. BERRY : subcylindric to ellipsoid, stigmatic remnant persistent, 1-seeded, dark green and red-spotted. SEED : ellipsoid, testa thin, white, smooth, transparent, embryo ellipsoid, dark green with red spots externally, whitish internally, undifferentiated, endosperm absent.

Diagnostic Description

Small evergreen, rhizomatous geophytes; leaf blade subreniform to broadly sagittate, often variegated, fine venation reticulate; peduncle equalling or longer than petiole, slender; spathe greenish, unconstricted, completely expanded; spadix female zone adnate to spathe; flowers unisexual, perigone absent. Differs from Filarum and Zomicarpella in having relatively thick, subcylindric terminal spadix appendix, stem a creeping rhizome, and 1-ovulate ovary.


Tropical humid forest (“terra firme”); geophytes on forest floor.


Peru, N. Brazil.

Distribution Map

  • Native distribution
Found in
  • Southern America Brazil Brazil North
  • Western South America Ecuador
  • Peru


  • 1 Govaerts, R. & Frodin, D.G. (2002). World Checklist and Bibliography of Araceae (and Acoraceae): 1-560. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • 2 Gardens, K.""Royal Bot World Checklist of Selected Plant Families. (2008).
  • 3 Mayo, S.J., Bogner, J. & Boyce, P.C. The Genera of Araceae. (Royal Botanic Gardens Kew: 1997).

 Information From

CATE Araceae
Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 14 Dec 2011 . 17 Dec 2011.
  • A All Rights Reserved
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from http://e-monocot.org.
  • B Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Checklist of Selected Plant Families
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://apps.kew.org/wcsp/ Retrieved 2011 onwards
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