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Rorippa palustris occidentalis

(Western Bog Yellowcress)

Common Names

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Common Names in English:

Bog Yellowcress, Marsh Cress, Western Bog Yellowcress, Yellow Watercress

Description

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Family Brassicaceae

Herbs annual , biennial, or perennial , sometimes subshrubs or shrubs , with a pungent , watery juice. Eglandular trichomes unicellular, simple , stalked or sessile, 2- to many forked , stellate , dendritic , or malpighiaceous (medifixed , bifid, appressed ), rarely peltate and scalelike; glandular trichomes multicellular, with uniseriate or multiseriate stalk . Stems erect , ascending , or prostrate , sometimes absent. Leaves exstipulate , simple, entire or variously pinnately dissected , rarely trifoliolate or pinnately, palmately, or bipinnately compound ; basal leaf rosette present or absent; cauline leaves almost always alternate, rarely opposite or whorled , petiolate or sessile, sometimes absent. Inflorescence bracteate or ebracteate racemes , corymbs, or panicles, sometimes flowers solitary on long pedicels originating from axils of rosette leaves . Flowers hypogynous, mostly actinomorphic . Sepals 4, in 2 decussate pairs, free or rarely united , not saccate or lateral (inner) pair saccate. Petals 4, alternate with sepals, arranged in the form of a cross (cruciform ; hence the earlier family name Cruciferae), rarely rudimentary or absent. Stamens 6, in 2 whorls, tetradynamous (lateral (outer) pair shorter than median (inner) 2 pairs), rarely equal or in 3 pairs of unequal length , sometimes stamens 2 or 4, very rarely 8-24; filaments slender, winged , or appendaged, median pairs free or rarely united; anthers dithecal , dehiscing by longitudinal slits. Pollen grains 3-colpate, trinucleate . Nectar glands receptacular , highly diversified in number, shape , size, and disposition around base of filaments, always present opposite bases of lateral filaments, median glands present or absent. Pistil 2-carpelled; ovary superior, sessile or borne on a distinct gynophore , mostly 2-locular and with a false septum connecting 2 placentae; placentation parietal , rarely apical; ovules anatropous or campylotropous, bitegmic, 1 to many per locule. Fruit typically a 2-valved capsule, generally termed silique (siliqua) when length 3 × or more than width , or silicle (silicula) when length less than 3 × width, dehiscent or indehiscent, sometimes schizocarpic, nutletlike, lomentaceous , or samaroid , segmented or not, terete , angled , or flattened parallel to septum (latiseptate ) or at a right angle to septum (angustiseptate) ; valves 2(or 3-6) ; replum (persistent placenta) rounded , rarely flattened or winged; septum complete, perforated, reduced to a rim , or lacking; style 1, distinct, obsolete , or absent; stigma capitate or conical , entire or 2-lobed, sometimes lobes decurrent and free or connate . Seeds without endosperm, uniseriately or biseriately arranged in each locule, aseriate when 1, winged or wingless, mucilaginous or not when wetted; cotyledons incumbent (embryo notorrhizal: radicle lying along back of 1 cotyledon), accumbent (embryo pleurorrhizal: radicle applied to margins of both cotyledons), or conduplicate (embryo orthoplocal: cotyledons folded longitudinally around radicle), rarely spirally coiled (embryo spirolobal) . Germination epigeal.

About 330 genera and 3500 species: all continents except Antarctica, mainly in temperate areas, with highest diversity in Irano-Turanian, Mediterranean, and W North American regions; 102 genera (eight endemic) and 412 species (115 endemic) in China.

Because of lack of a comprehensive classification based on phylogenetic relationships among genera, and in order to facilitate direct comparison between the accounts in FOC and FRPS, the sequence of genera follows Schulz (Nat. Pflanzenfam. 17b: 227-658. 1936) . However, it should be emphasized that his system is largely artificial because he placed closely related genera in different tribes and remotely related genera in the same tribe. For example, Arabis, Aubrieta, Draba, and Macropodium, which are very closely related on the basis of recent molecular studies, were placed by Schulz in four different tribes, whereas the unrelated Capsella, Lepidium, and Thlaspi were placed in one tribe. The delimitation of genera is often difficult, and mature fruits are needed for reliable identification.

The Brassicaceae include many important crop plants that are grown as vegetables (Brassica, Nasturtium, Raphanus) and sources of vegetable oils (Brassica) and condiments (Armoracia, Brassica, Eutrema, Sinapis) . Oils of Brassica probably rank first in terms of tonnage of the world's production of edible oils. The family includes many ornamentals in the genera Erysimum, Iberis Linnaeus, Lobularia, Malcolmia, and Matthiola. Of these, only Lobularia maritima has become naturalized in China. The family also includes more than 120 species of weeds . Arabidopsis thaliana, which is naturalized in China, has become the model organism in many fields of experimental biology .

The delimitation of genera in the Brassicaceae is often difficult because of the frequent independent evolution of what appear to be similar character states , the variability of a given character in one genus and its fixture in another, and the inadequate sampling of material by most authors . Fruit characters are essential in the identification of genera. However, a key emphasizing flowering material is given in addition to the one emphasizing fruit. The most reliable determination of genera can be achieved when the material has both fruit and flowers and when both keys are successfully used to reach the same genus.

The types of cotyledonary position, which in reality is the position of the radicle in relation to the cotyledons (e.g. , radicle accumbent, incumbent, or conduplicate, though radicle referred to as "cotyledon" throughout) are important in the separation of many genera, and a cross section of the seed provides the easiest and simplest way of determining that position. The exact number of ovules per ovary can easily be determined from the fruit because aborted ovules persist through fruit dehiscence. However, it is more laborious to determine the ovule number from pistils and young fruit.[1]

Genus Rorippa

Herbs annual , biennial, or perennial , usually of wet or aquatic habitats . Trichomes absent or simple . Stems erect or prostrate , simple or branched, leafy. Basal leaves petiolate , rosulate or not, simple, entire, dentate , sinuate , lyrate, pectinate , or 1-3-pinnatisect. Cauline leaves petiolate or sessile, cuneate, attenuate, auriculate , or sagittate at base , entire, dentate, pinnatifid , or pinnatisect . Racemes ebracteate or rarely bracteate throughout, elongated in fruit. Sepals ovate or oblong , erect or spreading , base of lateral pair not saccate or rarely saccate, margin often membranous. Petals yellow, sometimes white or pink, rarely vestigial or absent; blade obovate , spatulate , oblong, or oblanceolate , apex obtuse or emarginate ; claw sometimes distinct , often shorter than sepals. Stamens 6 and tetradynamous , rarely 4 and equal in length ; anthers ovate or oblong, obtuse or rarely apiculate at apex. Nectar glands confluent , often subtending bases of all stamens; median glands narrow; lateral glands semiannular and intrastaminal , or annular . Ovules 10-300 per ovary. Fruit dehiscent siliques or silicles , linear , oblong, ovoid , ellipsoid , or globose , terete or slightly latiseptate , sessile or rarely shortly stipitate ; valves 2(or 3-6), papery or leathery, veinless or obscurely veined, smooth or torulose ; replum rounded ; septum complete or rarely perforated, membranous, translucent , veinless; style obsolete or distinct; stigma capitate, entire or slightly 2-lobed. Seeds biseriate or rarely uniseriate , wingless or rarely winged , oblong, ovoid, or ellipsoid, plump; seed coat reticulate , colliculate , rugose , tuberculate , or foveolate, mucilaginous or not when wetted; cotyledons accumbent .

About 75 species: worldwide; nine species in China.[2]

Physical Description

Habit: Forb/herb

Habitat

Typically found at an altitude of 0 to 1,840 meters (0 to 6,037 feet).[3]

Biology

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Reproduction

Duration: Annual , Biennial, Perennial

Taxonomy

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Unambiguous Synonyms

  1. Rorippa palustris (L.) Besser Occidentalis (S. Watson) Abrams

Notes

Place of publication : Enum. pl. 27. 1821

Name verified on 27-Apr-1992 by ARS Systematic Botanists. Last updated: 23-Aug-1994

Similar Species

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Members of the genus Rorippa

ZipcodeZoo has pages for 168 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

R. africana · R. alpina (Alpine Yellowcress) · R. americana · R. amphibia (Great Yellow-Cress) · R. anceps · R. aquatica · R. armoracia · R. armoracioides · R. aspera · R. aspera aspera · R. aspera subsp. praeterita · R. astylis · R. atlantica · R. atrovirens · R. aurea · R. austriaca (Austrian Fieldcress Rorippa Austriaca) · R. austroamericana · R. barbareaefolia · R. barbareifolia (Hoary Yellowcress) · R. beckii · R. benghalensis · R. boissieri · R. bonariensis · R. bonariensis var. chacoensis · R. brachycarpa · R. calycina (Persistent Sepal Yellowcress) · R. cantoniensis (Cantonese Yellow Cress) · R. chubutica · R. clandestina · R. coloradensis (San Luis Yellowcress) · R. columbiae (Columbian Yellowcress) · R. cryptantha · R. crystallina (Mackenzie River Yellowcress) · R. curvipes (Blunt-Leaf Yellowcress) · R. curvipes Greene var. truncata (Jeps.) Rollins · R. curvipes var. curvipes (Blunt-Leaf Yellowcress) · R. curvipes var. truncata (Bluntleaf Yellowcress) · R. curvisiliqua (Curvepod Yellowcress) · R. curvisiliqua var. curvisiliqua (Curvepod Yellowcress) · R. curvisiliqua var. lyrata (Lyrateleaf Yellowcress) · R. curvisiliqua var. nuttallii (Nuttall's Yellowcress) · R. curvisiliqua var. occidentalis (Western Yellowcress) · R. curvisiliqua var. orientalis (Oriental Yellowcress) · R. curvisiliqua var. procumbens (Curvepod Yellowcress) · R. curvisiliqua var. spatulata (Curvepod Yellowcress) · R. dentata · R. dictyosperma · R. dictyota · R. dietrichiana · R. divaricata · R. dogadovae · R. dubia (Thai Watercress) · R. eggersii · R. elata · R. erythrocaulis · R. eustylis · R. floridana (Florida Yellowcress) · R. fluviatilis · R. gambelii (Gambel's Yellowcress) · R. gambellii · R. gigantea · R. globosa (Globe Yellowcress) · R. hayanica · R. heterophylla · R. hilariana · R. hispanica · R. hispida · R. humifusa · R. hybrida · R. icarica · R. indica (Variableleaf Yellowcress) · R. indica var. apetala (Variableleaf Yellowcress) · R. indica var. indica (Variableleaf Yellowcress) · R. insularis · R. integra · R. integrifolia · R. intermedia (Intermediate Yellowcress) · R. islandica (Northern Marsh Yellowcress) · R. islandica fernaldiana · R. islandica subsp. hispida · R. islandica microcarpa · R. kayanica · R. kerneri · R. laciniata · R. laurentii subsp. tsaratananae · R. liaotungensis · R. lippizensis · R. madagascariensis · R. mandonii · R. megasperma · R. mexicana · R. micrantha · R. microphylla (Onerow Yellowcress) · R. microphyllum · R. microsperma · R. microtitis (Chihuahuan Yellowcress) · R. millefolia · R. montana · R. multicaulis · R. nana

More Info

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Further Reading

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Notes

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Contributors

Identifiers

Footnotes

  1. Tai-yien Cheo, Lianli Lu, Guang Yang, Ihsan Al-Shehbaz & Vladimir Dorofeev "Brassicaceae". in Flora of China Vol. 8 Page 1. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. "Rorippa". in Flora of China Vol. 8 Page 132. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  3. Mean = 173.860 meters (570.407 feet), Standard Deviation = 222.230 based on 3,541 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/1/2009