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Urtica chengkouensis, a new species of Urticaceae from Chongqing, China

城口荨麻,重庆荨麻科一新种



全 文 :  Guihaia  Jun. 2016ꎬ 36 (增刊 1): 205-206
http: / / journal.gxzw.gxib.cn
http: / / www.guihaia-journal.com
【原文刊载】 “城口荨麻ꎬ 重庆荨麻科一新种” 已于 “中国知网 (CNKI)” 单篇优先数字出版ꎬ «广西植物»待刊ꎮ
城口荨麻ꎬ 重庆荨麻科一新种
王文采
( 中国科学院植物研究所 系统与进化植物学国家重点实验室ꎬ 北京 100093 )
摘  要: 描述了自重庆市发现的荨麻科荨麻属一新种ꎬ城口荨麻ꎬ此种与异株荨麻有亲缘关系ꎬ区别特征为此
种的茎被少数刺毛ꎬ叶片多为心形ꎬ雄、雌花序均不分枝ꎬ瘦果在中央稍凹陷ꎮ
关键词: 荨麻科ꎬ 荨麻属ꎬ 新种ꎬ 重庆
中图分类号: Q949     文献标识码: A    文章编号: 1000 ̄3142(2016)增刊 1 ̄0205 ̄02
Urtica chengkouensisꎬ a new species of
Urticaceae from Chongqingꎬ China
WANG Wen ̄Tsai
( State Key Laboratory of Systematic and Evolutionary Botanyꎬ Institute of Botanyꎬ Chinese Academy of Sciencesꎬ Beijing 100093ꎬ China )
Abstract: A species of the genus Urtica (Urticaceae)ꎬ U. chengkouensisꎬ is described as new from Chongqing Cityꎬ
China. This species is related to U. dioica L.ꎬ from which it differs in its stem with few stinging hairsꎬ its mostly cordate
leaf bladesꎬ its unbranched staminate and pistillate inflorescenesꎬ and its achenes which are slightly impressed at the
centre.
Key words: Urticaceaeꎬ Urticaꎬ new speciesꎬ Chongqing
    城口荨麻  图 1
Urtica chengkouensis W.T.Wangꎬsp.nov.Fig. 1.
(sect. Urtica ser. Urtica)
Ob stipulas in quoque nodo caulis 4 inter sese lib ̄
erasꎬ inflorescentias unisexualesꎬ tepala pistillata per ̄
sistentia interna acheniis fere aequilonga species nova
haec est affinis U. dioicae L.ꎬ a qua caule tantum in ̄
ferne pilis urentibus paucis obtectoꎬ foliorum laminis
plerumque cordatis 4-5.5 cm latis apice cuspidatis vel
caudatisꎬ inflorescentiis staminatis pistillatisque sim ̄
plicibus spiciformibusꎬ acheniis centro leviter impressis
differt. In U. dioicaꎬ caules pilis urentibus multis densis
obtectiꎬ foliorum laminae ovatae vel anguste ovataeꎬ an ̄
gustioresꎬ 2.5-4 cm latae apice acuminataeꎬ inflores ̄
centiae staminatae pistillataeque paniculataeꎬ et achenia
centro haud impressa sunt.
Prennial herb. Stem ca. 50 cm tallꎬ above base 2
mm in diam.ꎬ only below with a few stinging hairsꎬ in ̄
conspicuously longitudinally shallowly 4 ̄sulcate. Leaves
oppositeꎬ slenderly petiolateꎻ blades thinly paperyꎬ
mostly cordateꎬ 6-6.5 × 4-5.5 cmꎬ apex cuspidateꎬ
base cordateꎬ margin dentateꎬ those of apical leaves
smallerꎬ cordate ̄ovate or triangularꎬ 2 - 6 × 0. 6 - 3. 5
cmꎬ apex cuspidate or caudateꎬ base shallowly cordate
收稿日期: 2015 ̄10 ̄28    修回日期: 2016 ̄01 ̄19
作者简介: 王文采(1926-)ꎬ男ꎬ研究员ꎬ中国科学院院士ꎬ著名植物分类学家ꎬ长期从事有花植物分类学研究ꎮ
图 1  城口荨麻  A. 结果植株ꎻ B. 雄花序ꎬ雄花已脱落ꎻ C. 果期雌花序ꎻ D. 宿存雌花被和瘦果ꎻ E. 瘦果ꎮ
Fig. 1  Urtica chengkouensis  A. Fruiting plantꎻ B. Staminate inflorescenceꎬ with staminate flowers all fallen offꎻ
C. Fruiting pistillate inflorescenceꎻ D. Persistent perianth and acheneꎻ E. Achene. (from holotype)
or truncateꎬ margin dentateꎻ surfaces adaxially sparsely
strigose and with sparse appressed stinging hairsꎬ abaxi ̄
ally on nerves appressed ̄ puberulousꎻ nervation pal ̄
mately 5 ̄nervedꎬ with 2 pairs of secondary nerves of the
midribꎻ cystoliths puncticulateꎻ petioles slenderꎬ 0.8-3
cm longꎬ sparsely appressed ̄puberulous and with 4-15
stinging hairsꎻ stipules 4 per nodeꎬ freeꎬ membranousꎬ
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602 广  西  植  物                                      36卷