Echinoceres maritimus is a caespitose
mounding cactus, forming colonies
of spherical to cylindrical stems. In habitat they
can grow up to 2 m
in diameter and 40 cm tall, with as many as
300 stems! They may vary from long (usual) to short-spined.
This species resemble in habit with
Stems: Globose to cylindrical, light to dark green 5-30 cm tall,
2.5-7 cm in diameter.
Ribs: 8 to10,
acute, 8-15 mm wide.
Central and upper spines stout, 4 to 10,
pinkish to bright red, becoming dirty yellow or grey,
spreading, stiff, straight, strongly flattened and angled, erect,
2,5-6cm long. (up to 3 mm in diameter)
Radial spines: Radial and lower spines7 to12, spreading 1,5-2,5 cm long.
Flowers: Small, arising from
near the top of the plant,
infundibuliform, bright yellow, up to 6 cm long and in diameter.
Ovary not very spiny.
Fruits: Globose, green, becoming red, spiny, drying up but not
in 4-8 months.
Seeds: 1,2-1,3/1 mm dark/brown black.