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Orchids naturally shed old foliage. If the bottom leaves on a monopodial orchid turn yellow, the plant is probably just getting ready to drop them because the leaves are at the end of their life span.
The cauline leaves are sheathing the stem, with yellowish lanceolate bracts. The inflorescence comprises 5 to 30 small flowers. Their color varies from creamy white or pale yellow to various shades of pink and purple in some varieties. The lateral sepals are ovate and erect, the median sepal is slightly leaning forward. The labellum is trilobed ...
Cyanicula ixioides, commonly known as the white china orchid, [2] is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single, broad, flattened leaf and up to three yellow or white flowers. It mostly only occurs in woodlands and forest near Perth.
Lycaste flowers, like all orchid blooms, have three petals and three sepals. The petals are typically yellow, white, or orange, and the sepals are yellow, orange, green, or reddish brown. The petals and sepals may be marked sparsely or densely with red, reddish purple, purple, or reddish brown spots.
Left untreated, however, leaves may curl and turn yellow or brown, flowers may drop, and bloom times may be shortened. The fungus can also weaken and stunt plants, inhibiting photosynthesis and ...
Trachoma papuanum, commonly known as the yellow spectral orchid, [2] is an epiphytic or lithophytic clump-forming orchid with a between three and six thick, fleshy leaves and many dull yellow flowers with a white labellum opening in groups of up to four. This orchid occurs in New Guinea, Queensland and some islands in the South Pacific.
Phalaenopsis bellina has thick, succulent leaves. They are oval, light to medium green, and sometimes wavy. When mounted, leaves grow so that older, lower leaves are shifted towards the sides while new growth points downwards, in order to expose as much surface area to sunlight.
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