| 词条 | Gustavia angustifolia |
| 释义 |
| image = | status = | status_system = | status_ref = | genus = Gustavia (plant) | species = angustifolia | authority = Benth. }}Gustavia angustifolia is a small tree, native to South America, with large white flowers. It is an endangered species.[1] DescriptionLeavesPerhaps the most distinguishing feature of G. angustifolia is its leaves.[2] G. angustifolia has an abaxial leaf surface that is covered in short, fine velvety hairs which is an uncommon trait among the Gustavia genus.[2] In general the leaves are sessile but they can have petioles up to 30 mm long.[2] The leaf blades tend to be narrow, having an oblong to oblanceolate shape, while the leaf bases are attenuate to acute in shape.[2] Flowers and reproductionGustavia angustifolia has a gametic chromosome number of n=17.[2] The inflorescence of G. angustifolia is racemose and terminal, occurring at the end of the branches. Each raceme typically has 4-10 flowers and each flower has 8 petals.[2] The pedicels of the flowers range from 35mm-100mm in length.[2] The buds of G.angustifolia are tomentose with a gray coloration.[2] These flowers can grow to be 10 cm-14.5 cm in diameter. The petals have an elliptical shape and are 50-65mm long and 20–25 mm wide.[2] The androecium of G.angustifolia is fused. The fruit are globe shaped with a flat summit.[2]Habitat and ecologyGustavia angustifolia is native to the dry deciduous forests of the coastal plain of Ecuador and Colombia.[2] Pubescent leaves are beneficial in hot, dry environments such as these.[3] The tiny hairs help to keep the leaves cool by reflecting light and casting tiny shadows on the leaf surface.[3] In addition the hairs also provide a barrier between the leaf and the air thereby reducing the amount of exposed surface.[3] Deflecting sunlight and decreasing exposed surface area of the leaf are both adaptations for preventing water loss in the plant.[3] The flowers of this plant bloom in October and begin fruiting in November.[2]Synonyms and common namesWhile Gustavia angustifolia is the official scientific name, in the past it has been called Japarandiba angustifolia, Japarandiba ruizana, Gustavia angusta, Gustavia ruiziana, and Gustavia corymbosa.[4] Its common names are Membrillo de Monte and Membrillo de Montaña (Mountain quince).[2] References1. ^{{cite web|title=Listado de las especies por categoría|url=http://www.humboldt.org.co/conservacion/libros_rojos/descargas_lr/lr_plantas/09_novena_parte.pdf|accessdate=2012-04-28}} {{Taxonbar|from=Q5471385}}2. ^1 2 3 4 5 6 7 8 9 10 11 12 {{cite book|last=Prance|first=Ghillean|title=The actinomorphic-flowered new world lecythidaceae|year=1979|publisher=The New York Botanical Garden|location=Bronx, New York|pages=150–151}} 3. ^1 2 3 {{cite web|last=Gilmer|first=Maureen|title=Pubescence Protects Plants|url=http://www.hgtv.com/landscaping/pubescence-protects-plants/index.html|publisher=Scripps Networks, LLC|accessdate=2012-04-28}} 4. ^{{cite web|last=Stang|first=David|title=Gustavia angustifolia|url=http://zipcodezoo.com/Plants/G/Gustavia_angustifolia/#Notes|accessdate=2012-04-28}} 1 : Gustavia (plant) |
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