Angiosperms - Dicots
> Rhododendron simsii (映山紅/紅杜鵑) Red Azalea
Rhododendron simsii (映山紅/紅杜鵑) Red Azalea
(Cheung Chun Ting)
Updated on 26/03/2021
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General Information: Rhododendron simsii (映山紅/紅杜鵑) is also called red Azalea. They are flowering shrubs in the family Ericaceae (杜鵑花科). They are common species in Hong Kong found in secondary shrubland on hillsides and along streams. Flora Information: Calyx 5-lobed. Lobes elliptic ovate to triangular ovate. Corolla fused to form funnel-shaped, with 5-lobed. Bright red, with dark red dots on posterior lobes which act as nectar guide that assist pollinators to locate nectary gland. Therefore, the flower is zygomorphic (with one plane of symmetry). Fun Fact: Red Azalea is highly toxic. The leave and nectar contain neurotoxin called Grayanotoxin. They prevent inactivation and hence lead to persistent opening of voltage-gated sodium channels. Poisoning Features include hypotension, bradycardia , nausea, vomiting, sweating, dizziness, blurred vision and confusion. Respiratory depression and arrhythmias in severe cases. Reference: https://www.herbarium.gov.hk/FloraOfHK/Species/8099/8099_S_E.pdf https://www3.ha.org.hk/toxicplant/en/rhododendron_simsii.html https://en.wikipedia.org/wiki/Rhododendron_simsii
Tsz Wan Shan
Well-written description. Thanks for your input!
petal , sepal , pileus , suspensor , stipe , sporangium , Labellum , columella , zygosporangium , sporangiophore
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