Euphorbia with caudex – these are plants with thickened bases. Morphologically, these can be different formations – a thickening of the stem, with thin, sometimes leaf-like shoots departing from it; thickening of the above-ground part of the root, passing into the trunk; a shortened fleshy trunk with a rosette of large leaves at the apex. As a rule, these are small species, very sensitive to waterlogging. They reproduce mainly by seeds.
Varieties of Euphorbia With Caudex
It is native to the Eastern Cape Province (South Africa). The central stem is 3–5 cm tall and up to 5 cm across, continuing underground as a large fleshy cylindrical or cylindrical-conical caudex. Radial branches up to 3.7 cm in length, in culture often longer, erect, 6 mm or more in diameter, tuberous, diverging from the central growth point.
The leaves are linear, up to 10 mm long and 1 mm wide, rapidly falling. The flowers are yellow, solitary, located on the tops of the young central branches on peduncles 4 mm long, with 2-3 bracts up to 3 mm long. Ciatium with a diameter of 6 mm.
- Euphorbia flanaganii f. cristata – there are two forms, one with a crista central shoot and normal cylindrical side shoots, the other with only crista side shoots. The second form is more common. It forms a thick pillow-shaped shape up to 12-15 cm high and 30 cm wide.
It is native to the Cape Province of South Africa. A sprawling succulent shrub with a rosette of narrow serpentine stems emerging from a short central caudex partially submerged in the ground. The branches are cylindrical, without spines, knotty, green, covered with elongated tubercles. The leaves are rapidly falling, linear, sharp or blunt, up to 5 mm, thick and fleshy, flat or slightly concave above, very convex or keeled below. Ciatia are 12 mm in diameter, solitary, collected at the ends of the branches in the axils of the tubercles, with 5-7 small bracts.
Grows in South Africa (East Tanswaal), at altitudes of 305-885 m above sea level. Dwarf shrub up to 15-30 (40) cm tall. It has an underground caudex and an above-ground part of thin, repeatedly branching, intertwined branches. The branches are bluish-gray or copper-green, up to 15 cm long and 5-7.5 mm in diameter, indistinctly 4-5 faceted, often spirally twisted. The flowers are solitary, bright yellow, 3 mm in diameter.
It is a coastal plant of Southern Madagascar. It has a caudex towering above the ground. The stems are thick, cylindrical, erect, spreading or hanging, 5–10 cm long and 5 mm in diameter, gracefully curved. Leaves: evergreen, in rosettes at the ends of the branches, very different in shape, juiciness and color, oblong, lanceolate or lobed, 2-8 cm long and 0.3-3 cm wide, leathery, naked, multi-colored (dark green, pink, purple, white or variegated). The inflorescences are branched tassels. The tsiatia are 3 mm in diameter, surrounded by large yellowish-green or pinkish bracts.
From the south-east of Madagascar. It has creeping rhizomes, caudex rarely appears in culture. The stems form a hemispherical cushion, serpentine, up to 15 cm long and about 5 mm thick, covered with scars from fallen leaves. The leaves are in rosettes at the ends of the branches, dark reddish-green, fleshy, up to 2.5-3 cm long, cylindrical, 3 mm in diameter, deeply grooved on the upper side and curved in the form of a hook at the end. Cyatia are solitary or paired in the tassels, surrounded by large gray-purple or yellowish-pink bracts.
Comes from South Africa (Eastern Cape province and KwaZulu-Natal). The plant is up to 20 cm tall. Caudex is brown, spherical, barrel-shaped or columnar, unbranched or sometimes slightly branched, similar to a cone. The leaves are collected in a bundle at the apex of the caudex, falling in the dry season, lanceolate, willow-shaped, narrow, 7-15 cm long and 2 cm wide, light green. Cyatia is solitary and rather small (about 5-7 mm in diameter), yellowish-green, later reddish, surrounded by two ovate bracts measuring 1 x 2 cm.
It is from the east of the Cape province of South Africa. The stem is cone-shaped or truncated, turning into a turnip-shaped woody caudex 5–15 cm long and 6–7 cm in diameter. The branches are up to 15 cm long and 14 mm wide, spread, flattened, biconvex, dark green, with pinnate whitish markings. The ribs are winged, with notched teeth at a distance of about 6 mm from each other. The spines are paired, up to 4 mm long. The flowers are greenish-yellow, in tassels. Cyatium with a diameter of 4 mm.
Distributed in the tropics of West Africa (from Guinea to northern Nigeria). It has a fleshy caudex with large elongated leaves at the apex.
- Euphorbia poissonii f. variegata – leaves with an uneven yellowish border.