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(Last Modified On 3/8/2013)
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(Last Modified On 3/8/2013)
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Species
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HIBISCUS RADIATUS Gav.
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PlaceOfPublication
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Mon. Cl. Diss. Dec. 150, t. 54(2). 1787.
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Synonym
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Hibiscus unidens Lindl., Bot. Regist. pl. 878. 1825.Hibiscus cannabinus L. var. unidens (Lindl.) Hochr., Ann. Conserv. Jard. Bot. Geneve 4: 115. 1900.
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Description
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Herb, annual, up to 2-3 m high, the stem simple or branched, sparsely aculeo- late, the prickles pustular-based and upturned, otherwise glabrous or with a longi- tudinal short-hairy line changing radially at each node. Leaves with slender elongate petioles, these with the same indumentum as the stem, the stipules fili- form; blade polymorphic, simple and more or less subcircular to usually 3- to 5(-7)-palmatifid, the lobes elliptic to linear-ovate and acute or acuminate, serrate at the margins, up to 15 cm long, glabrate or with few minute prickles on the veins. Flowers axillary, solitary or in racemiform terminal inflorescences by reduc- tion of the uppermost leaves, subsessile or short-pedicellate, the pedicel stout, up to 5 mm long and aculeolate; epicalyx of 7-10 bractlets, these linear, channelled, united at the base and adnate to the base of the calyx, flattened and slightly dilated at the apex, usually with a small tooth-like appendage on the inner surface below the apex, 8-15 mm long, setose especially along the margins, the setae hyaline and pustular-based; calyx cupuliform, lobed to below the middle, 15-25 mm long, up to 30 mm in fruit, scarious, greenish or whitish, setose, the lobes long-acuminate, 3- nerved, eglandular; petals cuneate-obovate, rounded at the apex, 3.5-8 cm long, yellow or red, with crimson basal spots; staminal tube about 1 as long as the corolla, antheriferous on most of its length, the filaments mostly paired; style about as long as the staminal tube, the stigmas densely fimbrillate. Capsule surrounded by the persistent epicalyx and calyx, ovoid, acuminate, 15-20 mm long, densely ap- pressed-setose, the valves ligneous; seeds subreniform-angulate, 3-5 mm long, very minutely appressed-squamose.
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Habit
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Herb
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Note
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A fiber plant native to southeastern Asia, but now widespread in tropical and subtropical regions and sometimes cultivated for ornament.
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Specimen
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PANAMA: Juan Diaz, cult., Standley 30526 (US).
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Note
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Hibiscus radiatus is very similar to H. cannabinus L., from which it is distin- guished by the absence of an elongate gland near the base of the midrib on the lower leaf surface; and on the midvein of each calyx lobe, by the presence, in most cases, of a small tooth-like appendage below the apex on the inner surface of the epicalyx bractlets, and by the lack of a whitish tomentellum on the calyx. Further- more, cytological data presented by Menzel & Wilson (Am. J. Bot. 48: 651-657. 1961) support the specific separation of these two taxa (see also Bates, Baileya 13: 81-82. 1965).
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