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	Rorippa sessiliflora inflorescences
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Brassicales
Family:	Brassicaceae
Genus:	Rorippa
Species:	R. sessiliflora
Binomial name
	Rorippa sessiliflora; (Nuttall) Hitchcock

Rorippa sessiliflora:

Rorippa sessiliflora is a species of flowering plant in the family Brassicaceae (conserved name Cruciferae) known by the common name stalkless yellowcress^[1]^[2].

Distribution

Rorippa sessiliflora is native to midwestern and eastern United States from South Dakota south to Texas and east from Maryland south through Florida^[1]. The species is more frequent in the midwest than southeast^[3]. The northerly distribution limit coincides with the southern edge of the Wisconsin glaciation, with the occasional collections from previously glaciated areas further north and in Massachusetts possibly attributable to anthropogenic dispersal^[3].

Habitat

Rorippa sessiliflora grows in areas that are muddy and subject to disturbance, such as on banks of streams, ponds and lakes, as well as on roadsides, and fallow fields^[1]^[3]^[4].

Description

Rorippa sessiliflora is glabrous (hairless) annual with erect stems and whose species epithet "sessiliflora" refers to the plant's short pedicels, between 0.5 - 2 mm in length^[1]^[3]^[4]. Stuckey notes other distinctive features for this species as compared to other members of the genus Rorippa, including thick siliques that are wedge-shaped at the base^[3]. Although some sources note the absence of petals^[1]^[3], Radford et al. suggest the presence of diminutive petals less than 1.5 mm long^[4]. Stuckey indicates that the flowers may deviate from typical traits of crucifers, with variable numbers of stamen (3-6) within a plant and occasional anther fusion^[3].

References

^ ^a ^b ^c ^d ^e Al-Shehbaz, Ihsan A. "Rorippa Sessiliflora". Flora of North America. Retrieved April 01, 2020. {{cite web}}: Check date values in: |access-date= (help)CS1 maint: url-status (link)
^ "Plants Profile for Rorippa sessiliflora (stalkless yellowcress)". plants.sc.egov.usda.gov. Retrieved 2020-04-01.
^ ^a ^b ^c ^d ^e ^f ^g Stuckey, Ronald R. (1972). "Taxonomy and distribution of the genus Rorippa (Cruciferae) in North America". Sida. 4(4): 279–443 – via JSTOR.
^ ^a ^b ^c Radford, Albert E.; Ahles, Harry E.; Bell, C. Ritchie (1968). Manual of the Vascular Flora of the Carolinas. Chapel Hill: The University of North Carolina Press. p. 503.

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[:0-1] Al-Shehbaz, Ihsan A. "Rorippa Sessiliflora". Flora of North America. Retrieved April 01, 2020. {{cite web}}: Check date values in: |access-date= (help)CS1 maint: url-status (link)

[2] "Plants Profile for Rorippa sessiliflora (stalkless yellowcress)". plants.sc.egov.usda.gov. Retrieved 2020-04-01.

[:1-3] ^ ^a ^b ^c ^d ^e ^f ^g Stuckey, Ronald R. (1972). "Taxonomy and distribution of the genus Rorippa (Cruciferae) in North America". Sida. 4(4): 279–443 – via JSTOR.

[:2-4] Radford, Albert E.; Ahles, Harry E.; Bell, C. Ritchie (1968). Manual of the Vascular Flora of the Carolinas. Chapel Hill: The University of North Carolina Press. p. 503.

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