Arecaceae
Chamaedorea

Chamaedorea rhizomatosa Hodel

First published in Phytologia 68: 401 (1990)
This species is accepted
The native range of this species is Mexico (Oaxaca). It is a shrub and grows primarily in the seasonally dry tropical biome.

Descriptions

General Description
Habit: cespitose by means oflong rhizomes, forming well separated loose clusters of 6-12 erect or decumbent stems in area of 4 square m, to 2.5 m tall. Stems: 7-9 mm diam., green, ringed, internodes 2-10 cm long. Leaves: 3-6, erect-spreading, pinnate; sheath to 16 cm long, tubular, green, obliquely open apically, longitudinally striate-nerved; petiole 10-20 cm long, flat and green above, rounded and light green below, longitudinally striate-nerved; rachis 25-35 em long, angled and green above, rounded below with light yellow band extending onto sheath; pinnae 6-8 on each side of rachis, middle ones longest, these to 25 x 5 cm, basal ones 14 x 2 cm, lanceolate, slightly sigmoid, acuminate, contracted basally, a prominently raised midrib and two slightly less prominent submarginal primary nerves above, these yellowish below, 3-5 secondaries between midrib and each primary, tertiaries numerous, faint, apical pair of pinnae 13-17 x 5 cm with 5-7 primary nerves, 2-3 secondaries between each pair of primaries. Inflorescences: Staminate straight, erect or spreading; peduncle to 15 cm long, 4 mm wide at base and there flattened, 2.5 mm diam. at apex; bracts 4, tubular, obliquely open apically, acuteacuminate, bifid, finely longitudinally striate-nerved, prophyll 2-3 cm long, 2nd bract 6 cm, 3rd 7 cm, 4th 5 cm and exceeding peduncle and extending onto rachis; rachis 5 cm long; rachillae 12, to 10 cm long, drooping. Pistillate not seen. Flowers: Staminate in moderately dense spirals, 2 mm apart, 2 x 2.5 mm in bud, globose, ± superficial but leaving elliptic scars 2.5 mm long; calyx 1-1.25 x 2 mm, lobed, sepals imbricate basally, rounded apically; petals 2 x 2.5 mm, broadly ovate, valvate, acute, apparently free apically; stamens 1.25-1.5 mm high, in a fairly tight ring around and shorter than pistillode, filaments 1 mm long, anthers 0.75-1 mm long; pistillode 1.75-2 mm high, ± equalling petals, columnar, flared apically. Pistillate not seen. Fruits: not seen.
Distribution
MEXICO. Oaxaca.
Biology
Moist pine-oak forest on a steep and rocky substrate on the Pacific slope; 1,400 m elevation.
[PW]

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: threatened. Confidence: confident
[AERP]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Palmweb - Palms of the World Online

    • Palmweb 2011. Palmweb: Palms of the World Online. Published on the internet http://www.palmweb.org. Accessed on 21/04/2013
    • Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License http://creativecommons.org/licenses/by-nc-sa/3.0