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A common example is the curling of Rhododendron leaves in response to cold temperatures. Mimosa pudica also show thermotropism by the collapsing of leaf petioles leading to the folding of leaflets, when temperature drops. [1] The term "thermotropism" was originated by French botanist Philippe Van Tieghem in his 1884 textbook Traité de ...
Dendrobium canaliculatum, commonly known as the brown tea tree orchid or thin tea tree orchid, [2] is an epiphytic or lithophytic orchid in the family Orchidaceae. It has cone-shaped or onion-shaped pseudobulbs, up to six deeply channelled, dark green leaves and up to thirty star-shaped, light brown to caramel-coloured white or greenish to apricot-coloured flowers with darker tips.
Orchid seeds are very small (0.35mm to 1.50mm long), spindle-shaped, and have an opening at the pointed end. [5] Each seed has an embryo that is undifferentiated and lacks root and shoot meristems. [3] An orchid seed does not have enough nutritional support to grow on its own, and lacks endosperm. [2]
Orchitis is inflammation of the testicles. [1] It can also involve swelling, pains and frequent infection, particularly of the epididymis , as in epididymitis . The term is from the Ancient Greek ὄρχις meaning "testicle"; same root as orchid .
Orchis provincialis is a herbaceous plant 20–40 centimetres (7.9–15.7 in) high. The 4-5 basal leaves are oblong-lanceolate, with a length of about 8 cm and arranged in a rosette, the color is green with purplish brown spots.
Goodyera pubescens is a plant in the Orchidaceae (orchid) family that is commonly found in North America. The genus Goodyera are terrestrial plants with a fleshy rhizome with basal evergreen leaves in a rosette pattern - frequently having white or pale green markings. Inflorescences are in the form of a spike of small flowers, usually white ...
Calcium deficiency symptoms appear initially as localized tissue necrosis leading to stunted plant growth, necrotic leaf margins on young leaves or curling of the leaves, and eventual death of terminal buds and root tips. Generally, the new growth and rapidly growing tissues of the plant are affected first.
As the leaves develop, they become increasingly distorted, and ultimately thick and rubbery compared to normal leaves. The color of the leaves changes from the normal green to red and purple, until a whitish bloom covers each leaf. Finally, the dead leaf may dry and turn black before it is cast off. Changes in the bark are less noticeable, if ...