毛茛葉天胡荽

毛茛葉天胡荽學名Hydrocotyle ranunculifolia Ohwi，五加科天胡荽亞科天胡荽屬多年生草本植物，原產於台灣，台灣天胡荽與大屯山天胡荽自然雜交所衍化而生之天胡荽，植株平臥，節上生根，莖匍匐，枝條被毛，單葉互生，單葉互生，葉圓心形、近圓形、圓腎形，葉形變化多，三至五掌裂，淺裂至深裂，通常五深裂，形似台灣天胡荽至大屯山天胡荽，裂片菱形，裂端鈍狀，基部心形，葉緣三至五裂，每一裂片裂端三至五淺裂，葉寬一、二公分，葉紙質，葉面綠、深綠、翠綠色，葉表面或脈上疏被直毛，葉背被短毛，放射狀羽狀脈，似掌狀，細脈網狀，托葉膜質，淡褐色，半透明狀，闊三角形，具長葉柄，密被捲曲毛，兩性花，繖形花序，頭狀排列，腋生，叢生狀，花序與葉對生，著生於節上，具小花五、六枚，總梗綠色，絲狀，花梗長不足半公釐，總苞片宿存，苞片綠白色，卵狀披針形，花萼合生筒狀，萼齒微小或不明顯，萼片五枚，綠白色，卵狀三角形，長寬不足半公釐，與子房合生，花冠幅形、星形，輻射對稱，花徑約一公釐，花淡粉紅至黃白色，早落，花瓣五枚，通常內曲，鑷合狀排列，雄蕊五枚，與花瓣互生，花藥淺褐色，丁字著生，二室，縱裂，雌蕊心皮二枚，合生，花柱圓柱形，著生於花盤上，基部膨大，成花柱基，柱頭二歧，子房綠色，扁球形，高與徑不足一公釐，厚不足半公釐，子房下位，子房一、二室，中軸胎座，或說基生胎座，每室具胚珠一枚，扁狀橢圓球形，離果，扁球形、近球形，長與寬約一公釐，綠、褐色，離果聚集約六至八枚，雙懸果，分果片二枚，無果瓣柄，果熟分離，具五縱稜，果稜明，先端具宿存花柱，果梗短或無，種子半圓形，扁平狀。

天胡荽(Hydrocotyle)屬原屬於繖形科，依APG II分類法移入五加科。

天胡荽(Hydrocotyle)屬常見之品種有：
----------------------------------------------
Hydrocotyle acutiloba
Hydrocotyle algida
Hydrocotyle asiatica(雷公根) 註：歸雷公根屬(Centella)
----------------------------------------------
Hydrocotyle batrachium(台灣天胡荽)
Hydrocotyle benguetensis(菲島天胡荽、呂宋天胡荽)
Hydrocotyle bonariensis(大葉銅錢草)
----------------------------------------------
Hydrocotyle calcicola(石山天胡荽)
Hydrocotyle callicarpa
Hydrocotyle changanensis(長安天胡荽)
----------------------------------------------
Hydrocotyle delicata(姬天胡荽)
Hydrocotyle dichondroides(毛天胡荽、毛柄天胡荽)
Hydrocotyle dichondroides var. dichondroides(毛天胡荽)
Hydrocotyle dichondroides var. tatunensis(大屯山天胡荽)
Hydrocotyle dielsiana(裂葉天胡荽)
Hydrocotyle dissecta
----------------------------------------------
Hydrocotyle foveolata
----------------------------------------------
Hydrocotyle geraniifolia
----------------------------------------------
Hydrocotyle heteromeria
Hydrocotyle himalaica(喜馬拉雅天胡荽)
Hydrocotyle hirta
Hydrocotyle hookeri(阿薩姆天胡荽)
Hydrocotyle hookeri subsp. chinensis(中華天胡荽)
Hydrocotyle hookeri subsp. handelii(普渡天胡荽)
----------------------------------------------
Hydrocotyle javanica(爪哇天胡荽)
Hydrocotyle javanica var. chinensis(中華胡荽、地彈花)
----------------------------------------------
Hydrocotyle keelungensis(基隆天胡荽)
----------------------------------------------
Hydrocotyle leucocephala(白頭天胡荽、金錢草、香香草)
----------------------------------------------
Hydrocotyle moschata
----------------------------------------------
Hydrocotyle nepalensis(乞食碗、紅馬蹄草)
Hydrocotyle novae-zelandiae
----------------------------------------------
Hydrocotyle pedicellosa(大雷公根)
Hydrocotyle peduncularis
Hydrocotyle peltiformis
Hydrocotyle podantha(柄花天胡荽)
Hydrocotyle prolifera
Hydrocotyle pseudoconferta(密繖天胡荽、密傘天胡荽)
Hydrocotyle pterocarpa
----------------------------------------------
Hydrocotyle ramiflora(長梗天胡荽)
Hydrocotyle ranunculifolia(毛茛葉天胡荽)
Hydrocotyle ranunculoides
----------------------------------------------
Hydrocotyle setulosa(阿里山天胡荽、刺毛天胡荽)
Hydrocotyle salwinica(怒江天胡荽)
Hydrocotyle sibthorpioides(天胡荽、南美天胡荽)
Hydrocotyle sibthorpioides var. batrachium
Hydrocotyle sibthorpioides var. sibthorpioides(原變種)
Hydrocotyle sibthorpioides var. tuberifera(基隆天胡荽)
Hydrocotyle sibthorpioides 'Crystal Confetti'
Hydrocotyle sibthorpioides 'Lawn Pennywort'
Hydrocotyle sibthorpioides 'Variegata'
Hydrocotyle sp. australia(澳洲天湖葵)
----------------------------------------------
Hydrocotyle trachycarpa
----------------------------------------------
Hydrocotyle umbellata(繖形天胡荽)
----------------------------------------------
Hydrocotyle verticillata(銅錢草、錢幣草、銅幣草、圓幣草、南美天胡荽)
Hydrocotyle vulgaris(野天胡荽、香菇草、盾葉天胡荽)
----------------------------------------------
Hydrocotyle wilfordii(腎葉天胡荽、惠氏天胡荽)
Hydrocotyle wilsonii(鄂西天胡荽)
----------------------------------------------