Flora of China
  FOC Vol.13 (2007)              | Family List  Haloragaceae  PDF     | Link Font:+ Big | - Small
   30. Haloragaceae  R. Brown
小二仙草科   xiao er xian cao ke
Authors:Chen Jiarui (陈家瑞 Chen Chia-jui); A. Michele Funston


Herbs perennial, rarely annual, aquatic or terrestrial, monoecious or dioecious. Stem creeping, ascending or erect, often rooting at lower nodes. Leaves estipulate, 2-4-whorled, decussate, or alternate, in terrestrial species always simple, in aquatic submersed species always pectinately lobed. Inflorescence an indeterminate or determinate spike of 1-5-flowered dichasia borne in axils of leaflike primary bracts; occasional lateral inflorescences simpler. Flowers minute, actinomorphic, epigynous, protandrous, anemophilous or entomophilous, bisexual or unisexual. Sepals (2-)4, but absent in female flowers of some Myriophyllum, mostly persistent. Petals alternisepalous, (2-)4, absent in female flowers of some Myriophyllum, imbricate, longer than sepals, often deciduous with stamens. Stamens 1 or 2 × as many as sepals; filaments short, slender; anthers basifixed, mostly oblong or linear, 4-loculed, dehiscing by slits, antisepalous anthers sometimes somewhat longer than antipetalous ones; pollen grains shedding at 3-celled stage. Ovary inferior, 1(or 2)- or 4-celled, septa solid or practically absent (present only at base and apex of ovary); styles as many (rarely half as many) as sepals, alternisepalous, free, mostly short, grading into globose or subulate stigmas, spreading in fruit; stigmatic papillae hairlike; ovules as many as styles, rarely 1, apical, pendulous, anatropous. Fruit nutlike or a drupe, variously ornamented with wings, ribs, and tubercles, indehiscent and 1-seeded or breaking up into (2-)4 1-seeded mericarps; pericarp membranous or endocarp woody; exocarp membranous or swollen and spongy. Seeds with thin testa; embryo cylindric, surrounded by thick, white albumen.

About eight genera and ca. 100 species: mainly S hemisphere, particularly Australia, but Myriophyllum cosmopolitan and Proserpinaca Linnaeus confined to the N hemisphere; two genera and 13 species (one endemic, one introduced) in China.

The spelling "Haloragidaceae" was used in FRPS, but the family name is conserved in Appendix IIB of the International Code of Botanical Nomenclature, where the spelling Haloragaceae is used.

Wan Wenhao. 2000. Haloragidaceae [sic]. In: Chen Chiajui, ed., Fl. Reipubl. Popularis Sin. 53(2): 134-143.

1Herbs terrestrial; all flowers with petals; fruit 1-loculed (septa almost absent), 1-seeded; leaves opposite or alternate, simple, margin entire to crenate-serrate.1  Gonocarpus    小二仙草属
+Herbs aquatic (in China); at least female flowers lacking petals or inconspicuous; fruit splitting at maturity into (2-)4 1-seeded mericarps; leaves whorled, at least the lower (submersed) ones pinnately divided.2  Myriophyllum    狐尾藻属
   Lower Taxon
  • Gonocarpus  Thunberg  小二仙草属
  • Myriophyllum  Linnaeus  狐尾藻属