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6. RHODOLEIA Champion ex Hooker, Bot. Mag. 76: t. 4509. 1850.

红花荷属 hong hua he shu

Trees or shrubs, evergreen. Leaves alternate, petiolate; stipules apparently absent; leaf blade ovate or lanceolate, leathery, margin entire, venation pinnate, sometimes with 3 basal veins, abaxially usually glaucous. Inflorescence capitate, axillary, pedunculate, usually nodding, 5–8-flowered; involucral bracts 5–many, imbricate, ovate-rounded, outer bracts usually much smaller than inner bracts. Flowers bisexual, zygomorphic. Floral cup very short, enclosing base of ovary. Sepals absent or rudimentary, number not distinguishable. Petals 2–5, well developed only on abaxial side of flower, red, spatulate or oblanceolate, clawed, straight in bud, head as whole rayed and flowerlike. Stamens 4–11, equal to or somewhat shorter than petals; filaments linear; anther thecae 2-sporangiate, each dehiscing by 2 valves; nectariferous disk scales present. Ovary semi-inferior; ovules 12–18 per locule, inserted on septum; styles long, very slender, nearly equal to stamens, apex acute, caducous or persistent in fruit. Capsules dehiscing loculicidally above middle by 4 valves; pericarp thin. Seeds flattened, mostly sterile and wingless, fertile seeds laterally narrowly winged; endosperm rather copious; cotyledons ovate, flat, fleshy; radicle cylindric, ca. 1/3 as long as cotyledons. 2n = 24.

About ten species: China, Indonesia, Malaysia, Myanmar, Vietnam; six species (three endemic) in China.

Vink (Flora Malesiana, ser. 1, 5: 371–374. 1957) regarded Rhodoleia as monospecific.

1 Petals linear-oblanceolate, 1.5–3 mm wide; leaf blade base rounded.   6 R. stenopetala
+ Petals spatulate or oblanceolate, 5–8 mm wide; leaf blade base cuneate.   (2)
2 (1) Leaf blade abaxially brown tomentose, reticulate veination adaxially very distinctly impressed.   5 R. forrestii
+ Leaf blade abaxially glabrous or with stellate scales, reticulate veination adaxially indistinct.   (3)
3 (2) Leaf blade abaxially stellately scaly; capsules long ovoid, 1.2–2 × 0.6–1 cm.   4 R. macrocarpa
+ Leaf blade abaxially glabrous or very sparsely stellately scaly; capsules subglobose, ca. 1 × 1 cm.   (4)
4 (3) Peduncles 2–3 cm long, with several scalelike bracts; petals 6–8 mm wide.   1 R. championii
+ Peduncles 1–1.5 cm long, with few or no bracts; petals 5–6 mm wide.   (5)
5 (4) Leaf blade oblong, lateral nerves indistinct, at ca. 45° to midrib; involucral bracts abaxially mostly whitish stellately pubescent, brown-pilose only at or near margin.   2 R. parvipetala
+ Leaf blade ovate-elliptic, lateral nerves abaxially prominent, pale, at ca. 30° to midrib; involucral bracts abaxially ferruginous-tomentose.   3 R. henryi

Lower Taxa


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