Philodendron tweedieanum Schott
  • Bonplandia (Hannover) 7: 29 (1859) 


Notes: Distribution: Brazil (Mato Grosso do Sul), Paraguay, NE. Argentina

General Description

STEM: erect, 50 (-100) cm tall, 5-15 cm diam., decumbent, or rhizo-matous, subterranean and appearing acaulous at soil surface, usually forming extensive stands; adventitious roots present, c. 0.8 cm diam.; internodes less than 1 mm long; prophyll scars less than 1 mm long; intravaginal squamules frequent to numerous, not long-persistent, 3-5 mm long, 1-2.5 mm wide at base, triangular-lanceolate, usually flattened; foliage leaf scars transverse-elliptic, c. 1 cm long, 2.3 cm wide. LEAF: prophyll 20-40 cm long; petiole (32-)40-90 (-104) cm long, usually distinctly longer than blade, 0.6-1 cm diam. at apex, above flattened to broadly sulcate with rounded margins; leaf blade normally broadly sagittate, somewhat glaucous, margins normally weakly repand, rarely subentire or sinuately lobed, overall length 30-52(-56) cm, overall width (21.5-)24-42(-44) cm; anterior division 20-37 cm long, 21-42 cm wide, normally wider than long, widest at base, apex subacute to rounded and apiculate, primary lateral veins 3-5 per side, concentrated towards segment base, arising at angle of (30-)40-90° to midrib; posterior divisions 10-20 cm long, 0.3-0.4 x overall blade length, 12-22(-25) cm wide, basal ribs denuded for 1.5-3 cm, tip normally retrorse, more rarely introrse or extrorse, acute-acuminate to broadly rounded, primary acroscopic veins 1-3, primary basiscopic veins 0-5, often very weak when present, width of basiscopic lamina very variable. INFLORESCENCE: peduncle (16-)20-46(-55) cm long, 1 -2 cm diam. at apex, spathe tapering towards apex, (9-)12-20 cm long, (2-)2.5-4(-4.3) cm diam. at middle, decurrent for (2.5-)3-4.5 cm, pale green on outer surface, cream-white on inner surface; spadix 12-17.5 cm long, fertile male zone (3.5-)4 - 5.5(-6.8) cm long, 1.1-1.8 cm diam., ± cylindric, narrower than sterile male zone, sterile male zone (4-)5.7-10 (-11) cm long, slightly conical, tapering from 1.6-2.4 cm diam. at base to 1.3-1.8 cm diam. at apex, female zone 1.3 - 2.5(-2.7) cm long, 1-2( -2.3) cm diam. FLOWERS: stamens 2.7-4 mm long, (0.6-)0.7 - 1(-1.3) mm diam. at apex; staminodes (1.3-)2-5 mm long, 1-1.8 mm diam. at apex, clavate, usually tapering evenly towards the base, occasionally more abruptly swollen at apex; gynoecium 3-4.5 mm long, ovary a little narrower than stigma, ± cylindric, raphide cells common to abundant in subepidermal tissue of ovary walls from apex to base, locules 4-8, ovules (1-2) per locule, inserted near base and at middle of ovary, well spaced from one another, style body slightly narrower than style crown and ovary, densely packed with abundant raphide cells around stylar canals, compitum not penetrating ovary, style crown with tanniniferous style lobes, central dome usually lacking, occasionally present and then equalling style lobes in height, stylar canals entering locules subapically, stigma (1.5-)1.8 - 2(-2.7) mm wide, containing many tannin hairs. INFRUCTESCENCE: No fertile fruit seen.

Habitat

In open riverine marshes ('pajonales' of Burkart 1957) on sandy soil, forming dense stands up to 50 m across. Crisci (1971) states that in drier soils the stems become subterranean, as described by Chodat & Vischer (1920) for P. dubium, while in wetter conditions the stems are aerial.

Distribution

Brazil (Mato Grosso do Sul), Paraguay, NE. Argentina.

Uses

Schulz, in notes accompanying sterile collections from Paraguay {Schulz 17848, CTES!) and Argentina {Schulz 17838), records that indigenous people use the petioles for cordage.

Distribution Map

 
  • Native distribution
Specimens
Found in
  • Southern America Brazil Brazil West-Central
  • Southern South America Argentina Northeast
  • Paraguay

  Bibliography

  • 1 Schinini, A. (2006). Adenda a las Araceae de la flora del Paraguay. Rojasiana 7(2): 51-62.
  • 2 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.
  • 3 Gardens, K.""Royal Bot World Checklist of Selected Plant Families. (2008).
  • 4 Mayo, S.Joseph A revision of Philodendron subgenus Meconostigma (Araceae). Kew Bull. 46 (4), (1991).

 Information From

CATE Araceae
http://araceae.e-monocot.org
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
Global Biodiversity Information Facility
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eMonocot
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eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from http://e-monocot.org.
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World Checklist of Selected Plant Families
http://apps.kew.org/wcsp/
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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