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Fabaceae

Fabaceae
Fabaceae image
  • VPAP
  • SW Field Guide
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CANOTIA 7(1)
PLANT : Trees, shrubs, herbs, or vines, often with nitrogen-fixing bacteria in root nodules. LEAVES : alternate, usually compound (pinnate, bipinnate, palmate) sometimes simple; stipules present, sometimes developing into spines. INFLORESCENCE : a terminal raceme, corymb, spike, or head. FLOWERS : usually bisexual, actinomorphic to papilionoid, hypogenous or perigynous; sepals 5, free or fused into a tube that is regular or somewhat bilabiate; petals mostly 5, rarely reduced or absent, free or fused into a tube, or the 2 lower ones often fused and the three upper ones distinct; stamens 5-10; ovary superior, composed of a single carpel with a terminal style and stigma; ovules 1-many, placentation marginal. FRUIT : usually dry and opening along both sutures (a typical legume), sometimes indehiscent, sometimes breaking into 1-seeded segments (a loment); seed with hard, often impervious testa, often long-lived; embryo typically large, with 2 conspicuous cotyledons. NOTES : Ca. 700 genera and 18,000 spp. of worldwide distribution. Some authors treat the three subfamilies, Caesalpinoideae, Mimosoideae, and Papilionoideae, as distinct families. Economically, legumes are one of the most important plant families, contributing food and forage throughout the world. They are well represented in Arizona, especially below the Mogollon Rim. On Rupert Barneby’s last trip through the American West, he suggested to June Beasley that she describe this group of Dalea segregates (Errazurizia, Marina, Parryella, Psorothamnus) for the VPA project. These genera along with Amorpha, Dalea, and Eysenhardtia all belong to the tribe Amorpheae, which in turn belongs to the subfamily Papilionoideae with pea -like flowers. We here provide a key to the AZ genera of the Amorpheae and a taxonomic treatment of the Dalea segregates. The Amorpheae are members of the Papilionoideae, which generally have bilaterally symmetric flowers with the uppermost petal (the banner) external in the bud and the two lowermost petals forming a keel. The Amorpheae can be distinguished from other tribes of Fabaceae by a combination of characters, namely: the presence of oil glands in the epidermis of the stems, leaves, calyx and sometimes the petals, these parts aromatic when bruised; hairs simple, basifixed; inflorescence determinate; ovules usually 1-2; fruit usually 1-seeded, indehiscent, falling with the calyx. REFERENCES: Rhodes, Suzanne, June Beasley and Tina Ayers. 2011. Fabaceae. CANOTIA 7: 1-13.
Common Name: catclaw acacia Duration: Perennial Nativity: Native Lifeform: Tree Wetland Status: FACU
Species within checklist: Las Cienegas National Conservation Area
Acacia constricta
Media resource of Acacia constricta
Acacia greggii
Media resource of Acacia greggii
Amorpha fruticosa
Media resource of Amorpha fruticosa
Astragalus nuttallianus
Media resource of Astragalus nuttallianus
Astragalus thurberi
Media resource of Astragalus thurberi
Astragalus vaccarum
Media resource of Astragalus vaccarum
Caesalpinia gilliesii
Media resource of Caesalpinia gilliesii
Calliandra eriophylla
Media resource of Calliandra eriophylla
Chamaecrista nictitans
Media resource of Chamaecrista nictitans
Crotalaria pumila
Media resource of Crotalaria pumila
Dalea brachystachya
Media resource of Dalea brachystachya
Dalea formosa
Media resource of Dalea formosa
Dalea lachnostachys
Media resource of Dalea lachnostachys
Dalea neomexicana
Media resource of Dalea neomexicana
Dalea pogonathera
Media resource of Dalea pogonathera
Desmanthus cooleyi
Media resource of Desmanthus cooleyi
Desmodium batocaulon
Media resource of Desmodium batocaulon
Desmodium retinens
Media resource of Desmodium retinens
Hoffmannseggia glauca
Media resource of Hoffmannseggia glauca
Lotus humistratus
Media resource of Lotus humistratus
Lupinus brevicaulis
Media resource of Lupinus brevicaulis
Lupinus concinnus
Media resource of Lupinus concinnus
Macroptilium gibbosifolium
Media resource of Macroptilium gibbosifolium
Melilotus indicus
Media resource of Melilotus indicus
Mimosa dysocarpa
Media resource of Mimosa dysocarpa
Pediomelum tenuiflorum
Media resource of Pediomelum tenuiflorum
Phaseolus acutifolius
Media resource of Phaseolus acutifolius
Prosopis juliflora
Media resource of Prosopis juliflora
Rhynchosia senna
Media resource of Rhynchosia senna
Senna hirsuta
Media resource of Senna hirsuta
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

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