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Cycas spherica

Description

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Family Cycadaceae

Trees or shrubs evergreen , dioecious, mostly palmlike; trunk columnar , sometimes dichotomously branched at apex, rarely ovoid-bulbous and subterranean , clothed with bases of fallen leaves; bark often thickened and roughened. Leaves borne at apex of trunk, 1(-3) -pinnately compound , spirally arranged ; new leaves erect (or somewhat inflexed and appearing coiled in C. multipinnata group), with circinnate leaflets ; petiole with spines representing (reduced basal leaflets), rarely unarmed , base swollen and hairy ; leaflets numerous , alternate to subopposite, dichotomously branched in a few species, midvein present, margin usually entire. Cataphylls prominent , alternate with leaves, hairy, apex often rigid and pungent . Pollen cones borne at apex of trunk, cylindric or fusiform ; microsporophylls numerous, scalelike, spirally and tightly arranged along axis of cone, with numerous microsporangia in groups abaxially; pollen tubes producing 2 motile sperm cells . Megasporophylls several to numerous, somewhat leaflike, alternating with flushes of leaves, arranged in a loose , "conelike" crown surrounding apex of trunk, each with a linear fertile stalk and an apical, pinnatifid or subentire sterile blade ; ovules (1 or) 2-5 on each side of stalk. Seeds drupelike, somewhat compressed ; seed coat 3-layered, consisting of colored sarcotesta , woody sclerotesta , and membranous endotesta . Cotyledons 2, united at base. Germination hypogeal, cryptocotylar . 2n = 22*.

One genus and ca. 60 species: E Africa (including Madagascar), E and S Asia, N Australia, Pacific Islands; 16 species (eight endemic) in China.

Ornamental species include Cycas revoluta, which is widely cultivated worldwide. Other species (e.g. , C. circinalis Linnaeus, C. media R. Brown, C. pectinata, C. rumphii Miquel, C. taitungensis, and C. thouarsii R. Brown) have excellent ornamental qualities. The stem starch , "sago" (not to be confused with the true sago as obtained from palms of the genus Metroxylon Rottboøll), is edible and is used in packing brewers’ yeast after the removal of cycasins which are highly toxic and carcinogenic . A paste of Cycas seeds and coconut oil is used for the treatment of skin complaints, wounds, ulcers, sores, and boils .[1]

Genus Cycas

Morphological characters and geographical distribution are the same as those for the family .[2]

Habitat

Typically found at an altitude of 0 to 875 meters (0 to 2,871 feet).[3]

Taxonomy

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Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: Wilson K .L.

Similar Species

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Members of the genus Cycas

ZipcodeZoo has pages for 221 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

C. aculeata · C. acuminatissima · C. angulata (Marlborough Blue Sago) · C. annaikalensis (Annaikal Cycas (India)) · C. apoa · C. arenicola · C. armstrongii (Australian Cycad) · C. arnhemica · C. arnhemica arnhemica · C. arnhemica muninga · C. arnhemica natja · C. arnhemica subsp. muninga · C. arnhemica subsp. natja · C. aurea · C. avenicola · C. badensis · C. baguanheensis · C. balansae · C. basaltica · C. beddomei (Andhra Pradesh Cycas) · C. bellefonti · C. bifida (Fork-Leafed Cycad) · C. boddami · C. bougainvilleana (Cycad) · C. brachycantha · C. brevipinnata · C. brunnea · C. caffer · C. cairnsiana (Mount Surprise Sago) · C. calcicola · C. campestris (Cycad) · C. canalis · C. canalis canalis · C. canalis carinata · C. canalis subsp. carinata · C. candida · C. celebica · C. chamaoensis (Cycad) · C. chamberlainii · C. changjiangensis (Cycad) · C. chevalieri · C. chonarsu · C. circinalis (Palm-Leaved Cycas) · C. circinalis subsp. papuana · C. circinalis vera · C. circinnalis · C. clivicola (Mountain Cycad) · C. clivicola lutea · C. clivicola subsp. lutea · C. cochinchinensis · C. collina · C. comorensis · C. condaoensis · C. conferta · C. couttsiana (Cycad) · C. crassipes · C. cupida · C. curranii · C. debaoensis (Multipinnate Cycas) · C. desolata · C. diannanensis (Cycad) · C. dilatata · C. dolichophylla (Cycad) · C. edentata (Cycad) · C. edentata de · C. elephantipes (Cycad) · C. elongata · C. fairchildiana · C. fairylakea · C. falcata (Cycad) · C. ferruginea (Cycad) · C. fugax · C. furfuracea · C. glauca · C. glaucophylla · C. gracilis · C. gracilis var. glauca · C. gracilis var. viridis · C. guizhouensis · C. hainanensis (Hainan Cycas) · C. hamelini · C. hoabinhensis · C. hongheensis (Cycad) · C. hypoleuca · C. immersa · C. indica · C. inermis · C. intermedia · C. javana · C. jenkinsiana · C. kedia (Australian Nut Palm) · C. kennedyana · C. kirkii · C. lane-poolei · C. lindstromii · C. lingshuigensis · C. litoralis (Sea Sago) · C. longiconifera · C. longipetiolula · C. longisporophylla

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal January 30, 2008:

Identifiers

Footnotes

  1. Jiarui Chen & Dennis W. Stevenson "Cycadaceae". in Flora of China Vol. 4 Page 1. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. "Cycas". in Flora of China Vol. 4 Page 1. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  3. Mean = -168.170 meters (-551.739 feet), Standard Deviation = 1,824.290 based on 6 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 2009-07-02