头九节Cephaelis laui (Merr. et Metc.) How Ko
头九节Cephaelis laui (Merr. et Metc.) How Ko
1．头九节（海南植物志）图版16：1-6
Cephaelis laui (Merr. et Metc.) How et Ko in Fl. Hainanica 3: 578, 337, fig. 754. 1974; 中国高等植物图鉴4: 251. 图5915. 1975.——Psychotria laui Merr. et Mete. in Lingnan Sci. Journ. 16: 403, fig. 4. 1937.
直立灌木，高1-2米。叶纸质，椭圆形或长圆形，长5-8厘米或过之，宽1.5-3厘米，顶端短渐尖，基部近楔形，全缘或不明显的波状，两面无毛，干后常红褐色；叶柄长不超过1厘米；托叶鞘状，长2-2.5毫米。头状花序直径1-2厘米，通常单生枝顶，很少对生，总花梗长2-3厘米或过之；苞片覆瓦状排列，被褐色绒毛，外轮下部合生成杯状，干后变红褐色；花5数，长3.5毫米；萼管无毛，萼檐裂片5，近三角形，比管长，密被长硬毛，上部边缘流苏状；花冠白色，长约2.2毫米，里面喉部密被长毛，檐部5裂，裂片近椭圆形，长不及1毫米，顶部喙状内弯；雄蕊5，不伸出；子房2室，柱头2或3，被毛。核果椭圆形，长6-8毫米，有5-8条直棱；种子弓形。花期秋冬。
海南特有，产昌江和东方。生于低海拔林中和山地林下，很少见。
《Flora of China》 Vol. 19 (2011)
Psychotria laui Merrill & F. P. Metcalf Lingnan Sci. J. 16: 403. 1937.
头九节 tou jiu jie
Cephaelis laui (Merrill & F. P. Metcalf) F. C. How & W. C. Ko.
Shrubs, 1-2 m tall; stems glabrous. Petiole 0.3-0.6 cm, glabrous; leaf blade drying papery, reddish brown, elliptic, elliptic-oblong, or lanceolate, 5-11 × 1.5-3.5 cm, glabrous on both surfaces, base acute to cuneate, margins flat or weakly crisped, apex acute to shortly acuminate; secondary veins 6-8 pairs, not forming a submarginal vein, without domatia; stipules caducous, triangular, interpetiolar or shortly united around stem, 2-5 mm, glabrous, acute. Inflorescences terminal, capitate, glabrous to puberulent, pedunculate; peduncle 1-3.5 cm; heads 1 or rarely 2, hemispherical, 1-2 cm in diam.; outermost bracts connate into a cupuliform involucre 5-6 mm, marginally irregular. Flowers sessile. Calyx with hypanthium portion turbinate, ca. 2 mm, glabrous; limb ca. 2 mm, deeply 5-lobed; lobes narrowly triangular, densely hirsute, ciliate. Corolla white, funnelform, glabrous outside; tube 2-3 mm, densely villous in throat inside; lobes subelliptic to triangular, 1-1.2 mm, apex rostrate. Drupes ellipsoid, oblong-ellipsoid, or narrowly ovoid, 6-8 mm, color not noted; pyrenes longitudinally 4- or 5-ridged. Fl. Jul.
Mountain forests. Hainan (Changjiang, Dongfang) [Vietnam (Poilane 21252 P!)].
The one developed flower seen resembles the long-styled form of distylous Psychotria species (Lau 27455, MO!). Several Vietnam specimens at P clearly belong to P. laui, and this species is here reported from that country as well.The one developed flower seen resembles the long-styled form of distylous Psychotria species (Lau 27455, MO!). Several Vietnam specimens at P clearly belong to P. laui, and this species is here reported from that country as well.
科名：茜草科 Rubiaceae
属名：头九节属 Cephaelis
1．头九节（海南植物志）图版16：1-6
Cephaelis laui (Merr. et Metc.) How et Ko in Fl. Hainanica 3: 578, 337, fig. 754. 1974; 中国高等植物图鉴4: 251. 图5915. 1975.——Psychotria laui Merr. et Mete. in Lingnan Sci. Journ. 16: 403, fig. 4. 1937.
直立灌木，高1-2米。叶纸质，椭圆形或长圆形，长5-8厘米或过之，宽1.5-3厘米，顶端短渐尖，基部近楔形，全缘或不明显的波状，两面无毛，干后常红褐色；叶柄长不超过1厘米；托叶鞘状，长2-2.5毫米。头状花序直径1-2厘米，通常单生枝顶，很少对生，总花梗长2-3厘米或过之；苞片覆瓦状排列，被褐色绒毛，外轮下部合生成杯状，干后变红褐色；花5数，长3.5毫米；萼管无毛，萼檐裂片5，近三角形，比管长，密被长硬毛，上部边缘流苏状；花冠白色，长约2.2毫米，里面喉部密被长毛，檐部5裂，裂片近椭圆形，长不及1毫米，顶部喙状内弯；雄蕊5，不伸出；子房2室，柱头2或3，被毛。核果椭圆形，长6-8毫米，有5-8条直棱；种子弓形。花期秋冬。
海南特有，产昌江和东方。生于低海拔林中和山地林下，很少见。
《Flora of China》 Vol. 19 (2011)
Psychotria laui Merrill & F. P. Metcalf Lingnan Sci. J. 16: 403. 1937.
头九节 tou jiu jie
Cephaelis laui (Merrill & F. P. Metcalf) F. C. How & W. C. Ko.
Shrubs, 1-2 m tall; stems glabrous. Petiole 0.3-0.6 cm, glabrous; leaf blade drying papery, reddish brown, elliptic, elliptic-oblong, or lanceolate, 5-11 × 1.5-3.5 cm, glabrous on both surfaces, base acute to cuneate, margins flat or weakly crisped, apex acute to shortly acuminate; secondary veins 6-8 pairs, not forming a submarginal vein, without domatia; stipules caducous, triangular, interpetiolar or shortly united around stem, 2-5 mm, glabrous, acute. Inflorescences terminal, capitate, glabrous to puberulent, pedunculate; peduncle 1-3.5 cm; heads 1 or rarely 2, hemispherical, 1-2 cm in diam.; outermost bracts connate into a cupuliform involucre 5-6 mm, marginally irregular. Flowers sessile. Calyx with hypanthium portion turbinate, ca. 2 mm, glabrous; limb ca. 2 mm, deeply 5-lobed; lobes narrowly triangular, densely hirsute, ciliate. Corolla white, funnelform, glabrous outside; tube 2-3 mm, densely villous in throat inside; lobes subelliptic to triangular, 1-1.2 mm, apex rostrate. Drupes ellipsoid, oblong-ellipsoid, or narrowly ovoid, 6-8 mm, color not noted; pyrenes longitudinally 4- or 5-ridged. Fl. Jul.
Mountain forests. Hainan (Changjiang, Dongfang) [Vietnam (Poilane 21252 P!)].
The one developed flower seen resembles the long-styled form of distylous Psychotria species (Lau 27455, MO!). Several Vietnam specimens at P clearly belong to P. laui, and this species is here reported from that country as well.The one developed flower seen resembles the long-styled form of distylous Psychotria species (Lau 27455, MO!). Several Vietnam specimens at P clearly belong to P. laui, and this species is here reported from that country as well.