Summary description from Wikipedia:

Asclepias perennis in languages:

English

Aquatic Milkweed

English

Swamp-forest Milkweed

English

Smoothseed Milkweed

English

Shore Milkweed

English

White Swamp Milkweed

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Parent Taxon

• Asclepias

Sibling Taxa

• Asclepias adscendens
• Asclepias albens
• Asclepias albicans
• Asclepias albicans × subulata
• Asclepias alpestris
• Asclepias amabilis
• Asclepias ameliae
• Asclepias amplexicaulis
• Asclepias amplexicaulis × syriaca
• Asclepias angustifolia
• Asclepias arenaria
• Asclepias asperula
• Asclepias asperula × viridis
• Asclepias atroviolacea
• Asclepias aurea
• Asclepias auriculata
• Asclepias barjoniifolia
• Asclepias bicuspis
• Asclepias bifida
• Asclepias boliviensis
• Asclepias brachystephana
• Asclepias brevicuspis
• Asclepias brevipes
• Asclepias californica
• Asclepias candida
• Asclepias cinerea
• Asclepias circinalis
• Asclepias compressidens
• Asclepias concinna
• Asclepias connivens
• Asclepias contrayerba
• Asclepias conzattii
• Asclepias cooperi
• Asclepias cordifolia
• Asclepias coulteri
• Asclepias crassinervis
• Asclepias crispa
• Asclepias crocea
• Asclepias cryptoceras
• Asclepias cucullata
• Asclepias cultriformis
• Asclepias curassavica
• Asclepias curtissii
• Asclepias cutleri
• Asclepias densiflora
• Asclepias dependens
• Asclepias disparilis
• Asclepias dissona
• Asclepias eastwoodiana
• Asclepias elata
• Asclepias elegantula
• Asclepias eminens
• Asclepias emoryi
• Asclepias engelmanniana
• Asclepias eriocarpa
• Asclepias erosa
• Asclepias euphorbiifolia
• Asclepias exaltata
• Asclepias exaltata × quadrifolia
• Asclepias exaltata × syriaca
• Asclepias expansa
• Asclepias fallax
• Asclepias fascicularis
• Asclepias feayi
• Asclepias fimbriata
• Asclepias flanaganii
• Asclepias flexuosa
• Asclepias foliosa
• Asclepias fournieri
• Asclepias fulva
• Asclepias gentryi
• Asclepias gibba
• Asclepias glaucescens
• Asclepias glaucescens × lynchiana
• Asclepias gordon-grayae
• Asclepias graminifolia
• Asclepias grandirandii
• Asclepias hallii
• Asclepias hirtella
• Asclepias hirtella × longifolia
• Asclepias humilis
• Asclepias humistrata
• Asclepias hypoleuca
• Asclepias inaequalis
• Asclepias incarnata
• Asclepias involucrata
• Asclepias involucrata × macrosperma
• Asclepias jaliscana
• Asclepias jorgeana
• Asclepias kamerunensis
• Asclepias labriformis
• Asclepias lanceolata
• Asclepias lanceolata × rubra
• Asclepias langsdorffii
• Asclepias lanuginosa
• Asclepias latifolia
• Asclepias lemmonii
• Asclepias leptopus
• Asclepias linaria
• Asclepias linearis
• Asclepias longifolia
• Asclepias longirostra
• Asclepias longissima
• Asclepias lynchiana
• Asclepias macropus
• Asclepias macrosperma
• Asclepias macrotis
• Asclepias macroura
• Asclepias masonii
• Asclepias mcvaughii
• Asclepias meadii
• Asclepias melantha
• Asclepias meliodora
• Asclepias mellodora
• Asclepias mexicana
• Asclepias meyeriana
• Asclepias michauxii
• Asclepias minutiflora
• Asclepias mirifica
• Asclepias montevaga
• Asclepias monticola
• Asclepias mtorwiensis
• Asclepias multicaulis
• Asclepias nana
• Asclepias navicularis
• Asclepias nivea
• Asclepias notha
• Asclepias nummularia
• Asclepias nummularioides
• Asclepias nuttii
• Asclepias nyctaginifolia
• Asclepias obovata
• Asclepias oenotheroides
• Asclepias oreophila
• Asclepias otarioides
• Asclepias ovalifolia
• Asclepias ovata
• Asclepias palustris
• Asclepias patens
• Asclepias pedicellata
• Asclepias pellucida
• Asclepias peltigera
• Asclepias perennis
• Asclepias pilgeriana
• Asclepias praemorsa
• Asclepias pratensis
• Asclepias pringlei
• Asclepias prostrata
• Asclepias pseudoamabilis
• Asclepias pseudofimbriata
• Asclepias pseudorubricaulis
• Asclepias puberula
• Asclepias pumila
• Asclepias pumila × subverticillata
• Asclepias pumila × verticillata
• Asclepias purpurascens
• Asclepias pygmaea
• Asclepias quadrifolia
• Asclepias quinquedentata
• Asclepias randii
• Asclepias rara
• Asclepias rubra
• Asclepias rusbyi
• Asclepias ruthiae
• Asclepias sanjuanensis
• Asclepias scaposa
• Asclepias schaffneri
• Asclepias scheryi
• Asclepias schlechteri
• Asclepias schumanniana
• Asclepias senecionifolia
• Asclepias similis
• Asclepias solanoana
• Asclepias speciosa
• Asclepias speciosa × syriaca
• Asclepias sperryi
• Asclepias standleyi
• Asclepias stellifera
• Asclepias stenophylla
• Asclepias subaphylla
• Asclepias subulata
• Asclepias subverticillata
• Asclepias sullivantii
• Asclepias syriaca
• Asclepias syriaca × purpurascens
• Asclepias syriaca × sullivantii
• Asclepias syriaca × tuberosa
• Asclepias texana
• Asclepias tomentosa
• Asclepias tuberosa
• Asclepias ulophylla
• Asclepias uncialis
• Asclepias variegata
• Asclepias velutina
• Asclepias verticillata
• Asclepias vestita
• Asclepias vicaria
• Asclepias vinosa
• Asclepias viridiflora
• Asclepias viridiflora × viridis
• Asclepias viridis
• Asclepias viridula
• Asclepias virletii
• Asclepias welshii
• Asclepias woodii
• Asclepias woodsoniana
• Asclepias zanthodacryon
• Asclepias × aequicornu

Top Observation Places

• San Antonio
• Tallahassee
• Gainesville
• Alafaya
• Spring
• Houston
• Pasadena
• Pearland
• Alief
• League City
• Sugar Land
• Missouri City