Ferocactus alamosanus Britton & Rose

Description: Ferocactus alamosanus is small barrel cactus, usually solitary but sometimes clumping.
Stem: Depressed globose to shortly cylindrical, up to 30 cm in diameter, 25 cm tall, occasionally much taller;
Ribs: 12-20 narrow, acute ribs.
Spines: Needle-like. Densely intermeshed with a reddish tinge in the new growth
Central spine: 1, sometimes flattened, up to 6 cm long;
Radial spines: 8, straw-coloured, 3 to 4 cm long .
Flowers: Wide open greenish yellow, up to 45 mm long, 35 mm in diameter. The petals are spatulate and broad.
Fruits: Dull brown-red fruits splitting open when ripe.
Remarks: This species has been considered a variety of Ferocactus pottsii (Salm-Dyck) Backeb., but based on morphology and habitat they are best considered as separate species. Therefore Ferocactus pottsii does not belong to the complex with Ferocactus alamosanus. It has to be excluded here and transferred in the group with Ferocactus emoryi etc. Two subspecies are recognized, the nominate form and subsp. reppenhagenii (G.Umger) N.P.Taylor. The subspecies 'alamosanus' has usually about 20 acute ribs, heavy spination, and only grows to 25 cm high. The subspecies 'reppenhagenii' has 12-18 rounder ribs and connecting areoles and will grow up to about 70-100 cm).

www.llifle.com/Encyclopedia/CACTI/Family/Cactaceae/1694/Ferocactus_alamosanus

 

어렵다.