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Viola sororia (/ v aɪ ˈ oʊ l ə s ə ˈ r ɔːr i ə / vy-OH-lə sə-ROR-ee-ə), [5] known commonly as the common blue violet, is a short-stemmed herbaceous perennial plant native to eastern North America. It is known by a number of common names, including common meadow violet, purple violet, woolly blue violet, hooded violet, and wood ...
Species are opportunistic plant pathogens, causing violet root rot of root crops and other plants of economic importance. [1] [2] The name "violet root rot" refers to the dark purple colour of the mycelial mats formed on the infected plants, usually at or below the soil line. It can cause total rot and structural failure of roots and ...
The disease was described as early as 370 BC by Hippocrates. [6] The underlying mechanism was first described by German physiologist and chemist Felix Hoppe-Seyler in 1871. [6] The name porphyria is from the Greek πορφύρα, porphyra, meaning "purple", a reference to the color of the urine that may be present during an attack. [6]
The name cyanosis literally means the blue disease or the blue condition. It is derived from the color cyan, which comes from cyanós (κυανός), the Greek word for blue. [12] It is postulated by Dr. Christen Lundsgaard that cyanosis was first described in 1749 by Jean-Baptiste de Sénac, a French physician who served King Louis XV. [13]
Basidiocarps (fruit bodies) are corticioid (patch-forming) and are typically violet to purple. Microscopically they have auricularioid (laterally septate) basidia . [ 1 ] Helicobasidium purpureum is an opportunistic plant pathogen and is one of the causes of violet root rot of crops and other plants.
Basidiocarps (fruit bodies) are corticioid (patch-forming) and are typically violet to purple. Microscopically they have auricularioid (laterally septate) basidia . [1] Helicobasidium longisporum is an opportunistic plant pathogen and is one of the causes of violet root rot of crops and other plants. [2]
Acrocyanosis may be a sign of a more serious medical problem, such as connective tissue diseases and diseases associated with central cyanosis. Other causative conditions include infections, toxicities, antiphospholipid syndrome, cryoglobulinemia, neoplasms. In these cases, the observed cutaneous changes are known as "secondary acrocyanosis".
The nodding flower is a violet about 1.5 cm (1 ⁄ 2 in) long, [3] with five purple petals. The lower three petals have white bases and purple veining. The two side petals are white-bearded near the throat. The upper two petals may have hooked spurs at their tips. [4] [5] [6] It is a perennial [7] blooming in late spring. [3]