Origin and Habitat: Parodia concinna is distributed in Southern Brazil (Rio Grande do Sul) and in practically all of Uruguay.
Altitude range: elevations from 20 to 300 meters above sea level.
Habitat and Ecology: The species grows on rocky outcrops in grasslands or pampas. A generation length of 10 years has been inferred based on field observations.
The species is relatively common but not abundant. The populations are decreasing, and a 50% decline over 30 years (including past and future) is estimated for Brazil based on direct observation, and if considering the whole range the decline is probably around 30%.
The major threats are cattle grazing, illegal collection and forestry of Eucalyptus.
English: Sun Cup
Description: Parodia concinna is small cactus species forming a flattened and much-ribbed sphere.
Stem: Simple, broadly globular or somewhat depressed at apex, eventually longer in age, about 3-10 cm tall, and 4-10 cm across, light or dark glossy green, ribbed and warty at the top.
Ribs: About 16 to 20, with somewhat conspicuous chin-like tubercles between the areoles
Areoles: Young areoles white-felted.
Spines: Spreading, setaceous, hair-like to bristle-like, some more or less curved to twisted, brown, reddish or partly whitish to yellowish often poorly differentiated as centrals and radials.
Radial spines: 9 to 25, about 5 to 7 mm long adpressed and interlaced.
Central spines: 1-4(-6), one much longer (1-2,5cm), spreading or turned downward.
Flowers: 1-5 produced together at the apex, bright yellow, funnel-shaped, large, about 5 to 8 cm across. Outer perianth-segments narrow, acute, reddish, inner perianth-segments oblong, yellow almost transparent, except the reddish tips, acute.
Stigma-lobes scarlet. Scales on the ovary hairy in their axils. Perianth-tube slender.
Blooming season: Summer.
Fruit: Green ovoid to globular approx. 1,5 cm long, thin-walled, splitting or disintegrating at maturity with more than 100 seeds per fruit.
Seed: 0,8 -1 mm, bell-shaped broadest at the hilum, somewhat, tuberculate, shiny and black.
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