Thelocactus rinconensis var. nidulans
Kakteen Sukk. 49: 245. 1977
Family
Cactaceae
Genus
Species
Thelocactus rinconensis var. nidulans
Author
(Quehl) Glass & R.A.Foster
Chinese genus
瘤玉属
Chinese name
-
Accepted
DescriptionEdit description
Habit
Usually solitary, develops a squat and highly ribbed stem with a flattened top.
Central Spines
0-4 straight, terete to angled, sometimes scaly with age, variable in length very short or to 6 (or more) cm long.
Seeds
1,7-2 mm long, 0,5-1 mm broad, net-patterned with polygonal or square areas.
Tubercles
Conical, angled quite pointed, elongate toward the tip but flattened on top,12-27 mm long, 7-15 mm wide, 8-15 mm high.
Flowers
3-5 cm long, 2,7-3 cm in diameter, salmon-pink or whitish, often yellowish in the throat, or occasionally yellowish or magenta with a dark midvein. Tube short, pericarpels coveredwith scales. The plants usually fail to flower until they are 5-9 years old.
Spines
All similar, long very variable in length, depending on the clone, dark, usually black-brown , pale at apex, but also grey, brown or yellow, with a distinctive silvery appearance, and sometimes shredding.
Ribs
20 to 25, rather indistinct, divided into strong tubercles.
Stem
Depressed-globose, 4-15 cm tall, 9-20 cm across gray, usually glaucous sometimes tinged with purple.
Radial Spines
0-5 very similar to the centrals, erect to radiating, straight 3-35(-50) mm long.
Fruits
Spherical ta oblong with scales, 7-9 mm in diameter, greenish or yellowish, slightly fleshy when ripe, opening by basal pore.
Areoles
Round to elongate, mostly more than 2 cm apart and without nectaries.