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Flora of Taiwan | Family List | Commelinaceae | Cyanotis

Cyanotis axillaris (Linn.), Sweet, Sweet’s Hort. Brit. 430. 1827; Cook, Aqu. Wetl. Pl. Ind. 87. fig. 72. 1996.


Cyanotis axillaris

Credit: Paul J. Grote

Amischophacelus axillaris (L.) Sweet, Rolla Rao et Kammathy, J. Linn. Soc. Bot. 59: 306, 1966; D. Y. Hong, Acta Phytotax. Sin. 12 (4): 478, 1974; D. Y. Hong et al., Fl. Reipubl. Popularis Sin. 13 (3): 120. pl. 30. 1997. Commelina axillaris L., Sp. Pl. 42, 1753. Tradescantia axillaris (L.) L., Syst. Veg. Ed. 13, 260, 1774. Zygomenes axillaris (L.) Salisb. In Trans. Hort. Soc. London, 1:271, 1812.

Annual or perennial spreading herbs. Roots fibrous. Stem creeping, branched, rooting at nodes, glabrous. Leaves sessile; blades linear to lanceolate, 2-8 cm long, 0.2-0.4 cm wide, apex acuminate, glabrous; sheath cylindrical, ca. 0.8 cm long, ciliate at mouth. Inflorescence axillary, consisting of 1-3 cincinni, enclosed in leaf-sheath, bracteoles almost hidden. Flower bisexual, actinomorphic; sepals 3, green, equal, ca. 8.5 mm long, ca. 4 mm wide, one glabrous, the others puberulent at ridge, apex free, united below; petals 3, blue or pink, apex free, united below, ca. 12 mm long; stamens 6, equal, anthers trapezoidal, ca. 1 mm long; filaments ca 12 mm long, inflated at tip, densely barbate above the middle; ovary ellipsoid, 3-angled, ca. 2.2 mm long, ca. 1 mm across, apex hispid; style inflated at tip, ca. 10 mm long, glabrous. Capsules trilocular, 3-valved, with a notched tip, ellipsoid, ca. 3.5 mm long, locules 2-seeded, apex hispid. Seeds uniseriate, trapezoidal in outline, lustrous, ca 1.6 mm long, ca 1 mm across, deeply pitted, embryotega apical, hilum punctiform.

Kaohsiung: Taiju (Tashu), Sukemoto 63 (TAI).

Eastern Africa, India, Sri Lanka, Indo-China Peninsula, China (Hongkong, Hainan), Malaysia, Philippines, Indonesia, Australia. Taiwan, at low altitudes. Flowering in May.(just record from specimens).

依據國外文獻 (Cook, 1996) 本種植物在台灣僅有一次採集記錄,即Sukemoto於1934年採自高雄鳳山郡大樹庄,之後就沒有記錄了。本種植物一般生長在沼澤、溼地、稻田或灌溉的溝渠,也常見於海岸地區,Faden依據分布情形,認為台灣可能也存在此分類群 (pers. comm.)。 此分類群植株不具基生葉,聚繖花序花梗短縮,聚集成頭狀著生於葉腋,花冠長,蒴果三裂,每一瓣先端有V字型凹陷,種子表面有許多深的窩孔,營養器官和Cy. arachnoidea類似,但葉顯然較狹窄,植株近光滑,不被有蛛絲毛。

Phenology: perennial herbs, evergreen

Roors form: roots fibrous

Stems form: monomorphic stem

Monomorphic stems habit: procumbent

Rooting at nodes or not: rooting at nodes

Lateral shoots: perforating

Phyllotaxis: spiral phyllotaxis

Leaves: petiole: sessile

Leaves: shape (if dimorphic leaves, selected by rosette leaves): lanceolate, linear

Leaves: apex: acuminate

Leaves: length (cm): 2-8

Leaves: width (cm): 0.2-0.4

Leaves indumentum: upper surface: glabrous

If upper surface glabrous, leaves indumentum: margin: glabrous

Prophyll: sheathing, apex acute

Inflorescence: take plance: axillary

Inflorescence: thyrse

Bracts: shape: absent

Corolla: actinomorphic: petal 3, base fused, equal

Flowers: bisexual

Sepals: sepal 3, equal

Sepals: color: greenish

Sepals: base: base fused

Sepals: shape: lanceolate

Sepals: indumentum: one glabrous, the others puberulent at ridge

Sepals: length (if dimorphic sepals, selected by anticous two) (mm): 8.5

Sepals: width (if dimorphic sepals, selected by anticous two) (mm): 4

Flowers: color: pink, purple, or blue

Petals: shape: connate below into a tube

Petals: length (mm): 12

Stamens form: monomorphic: fertile stamens 6

Ovarys: shape: ellipsoid

Ovarys: indumentum: apex hispid

Ovarys: length (mm): 2.2

Styles: indumentum: glabrous

Styles: length (mm): 10

Capsules: dehiscence: dehiscent

Capsules: shape: ellipsoid

Capsules: trilocular

Capsules: indumentum: apex hispid

Capsule locules seeds: number: 2

Capsules: length (mm): 3.5

Seeds: lengh (if dimorphic seeds, selected by dorsal one) (mm): 1.6

Seeds: width (if dimorphic seeds, selected by dorsal one) (mm): 1


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