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Accepted Scientific Name: Adromischus marianae var. immaculatus Uitewaal
Origin and Habitat: Cape Province, Little Namaqualand, South Africa.
Type locality: 8 miles north of Concordia on the road to Goodhouse.
Habitat: It grows in fissures on exposed sloping granite rock faces, together with a species of fern, Euphorbia dregeana, Ruschia frutescens, Ruschia albiflora, Othonna euphorbioides, Senecio cephalophora and Conophytum pellucidum.
Adromischus marianae (Marloth) A.Berger
Nat. Pflanzenfam., ed. 2 [Engler & Prantl] xviii a. 416 (1930)
Adromischus marianae var. hallii (Hutchison) Toelken
Bothalia 12 (3): 391 (1978)
- Adromischus marianae var. hallii (Hutchison) Toelken
- Adromischus hallii Hutchison
- Adromischus casmithianus Poelln.
- Adromischus nanus Poelln.
Adromischus marianae var. immaculatus Uitewaal
- Adromischus marianae var. immaculatus Uitewaal
- Adromischus marianae f. alveolatus (Hutchison) Pilbeam
- Adromischus alveolatus Hutchison
- Adromischus marianae var. antidorcatum (Poelln.) Pilbeam
- Adromischus antidorcatum Poelln.
- Adromischus marianae f. herrei (W.F.Barker) Pilbeam
- Adromischus marianae f. multicolor Pilbeam
Adromischus marianae var. kubusensis (Uitewaal) Toelken
Bothalia 12 (3): 391 (1978)
- Adromischus marianae var. kubusensis (Uitewaal) Toelken
- Adromischus kubusensis Uitewaal
- Adromischus blosianus Hutchison
- Adromischus geyeri Hutchison
- Adromischus rodinii Hutchison
Description: Adromischus marianae f. alveolatus is one of the innumerable morphological and geographical variant of the very variable Adromischus marianae. It is a naturally occurring form similar to Adromischus marianae f. herrei distinguished by peculiar leaves which are shorter less acute, generally more robust, and with a very rough surface. Tubercles are formed occasionally, and very often these run together to form minute and irregularly reticulate, low, rounded ridges. Some of these plants are quite extraordinary in shape.
Habit: It is a much-branched small perennial leaf succulent, with thick stems
Roots: Tuberous, occasionally continued in fat fibrous roots.
Stem: 1-2 cm long, up to 5 mm in diameter, thick ascending often constricted at the base, pale tan-green or yellow green, sometimes whitish, rugose.
Leaves: Up to 3.5 cm long and 20 mm wide, shortly petiolate, subopposite to sub- rosulate, horizontal to erect, usually symmetrical, sub-spherical to obovate or elliptic, longer than broad, often caniculate above, tappered at both ends, verrucose (warty), often alveolate, sometimes with small tubercles, unspotted, grey-green to greyish brown with a with a thick bloom. Base wedge-shaped. Margin only slightly raised and not horny, the apex often subacute.
Inflorescence: Simple spike-like thyrse,with 1-flowered cyme 10-25 cm high, peduncle up to 17 cm long, up to 2.5 mm thick, glaucous, sometimes zig-zag, lower 4 cm with about 5 thick, deltoid, pulverulent sterile bracts 1 or more mm wide and 2 mm long; rachis 10 to 15 cm.
Flowers: Buds terete, slightly grooved. Flowers up to 15 erect, single, usually spirally arranged about 1 cm apart, occasionally more crowded to almost opposite. Pedicels pulverulent, white, 4 to 7 mm, long, 2 to 3 mm thick, 1-1,2 cm long pale pink, with 5 petals basally fused to form a greyish-white cylindrical tube gradually tapered towards tip, erect at first, later spreading. Corolla-lobes 2-3 mm long, and 2 mm wide, deltoid, acute, spreading or recurved, pulverulent white with purple margins, rough and with club-shaped hairs mainly in throat. Anthers not protruding from corolla tube. Perianth tube glaucous, yellowish at base, green above, maroon at apex, bright green inside, 15 mm long, 5 mm across, barely inflated, constricted just below mouth, the cross-section at mid-point pentagonal. Filaments in two rows at about mid-tube, about 5 mm long, green.Anthers included, oblong, creamy yellow. Carpels 10 to 11 mm long, green, smooth, subulate, the styles abruptly narrowing, pale yellowish green, the stigmas included. Nectary scales about 1.7 mm long and broad yellow.
Seeds: Very small.
Subspecies, varieties, forms and cultivars of plants belonging to the Adromischus marianae group
- Adromischus geyeri Hutchison: has terete, chalky, mottled reddish-brown, grey-green leaves with a rounded tip. The horny margin is often not visible at the tip. Distribution: South Namibia. Diamond Area No.1.
- Adromischus marianae (Marloth) A.Berger: (var. marianiae) has grey to reddish darker markings along the leaves. It has the longest margin along the top edge of each leaf of any other variety. Distribution: Cederberg around Clanwilliam.
- Adromischus marianae f. alveolatus (Hutchison) Pilbeam: similar to f. herrei but with leaves which are shorter less acute, generally more robust, and with a very rough surface. Distribution: north of Concordia.
- Adromischus marianae var. antidorcatum (Poelln.) Pilbeam: has a a rough leaf surface similar to A. marianiae "immaculatus". Includes forms with short leaves. it is very variable. Distribution: Namaqualand, West. & South Bushmanland.
- Adromischus marianae var. hallii (Hutchison) Toelken: has the broadest, thickest leaves within the A. marianiae complex. Leaves are chalky, grey-green but red spotted forms have been found. Distribution: South Namibia, North & West Bushmanland.
- Adromischus marianae f. herrei (W.F.Barker) Pilbeam: has the roughest leaves and can resemble dried raisins! It is a small plant, characterised by petiolate leaves, thin stems and thin inflorescences. Distribution: Namaqualand coastal mountains.
- Adromischus marianae var. immaculatus Uitewaal: has cylindrical leaves, but with great variation in marking and texture. It usually has slighly rough leaves. Distribution: South Namaqualand, Knersvlakte.
- Adromischus marianae var. kubusensis (Uitewaal) Toelken: Very variable in leaf shape: the plain, grey-green leaves vary from long-cylindrical to short-fat. Distribution: Richtersveld mountains.
- Adromischus marianae cv. Little Spheroid: has superb and very peculiar round leaves. Distribution: Namaqualand, Northern Cape, South Africa.
Adromischus marianae f. alveolatus Photo by: Giuseppe Distefano
The gallery now contains thousands of pictures, however it is possible to do even more. We are, of course, seeking photos of species not yet shown in the gallery but not only that, we are also looking for better pictures than those already present. Read More...
Cultivation and Propagation: Adromischus marianae is a most beautiful succulent but rarely seen in cultivation. It is not the easiest species to cultivate, and highly prone to rotting off, both at the height of winter or summer.
Growth rate: It is a relatively fast growing species.
Soil: Use mineral well-permeable substratum with very little organic matter (peat, humus). It needs perfect drainage to flourish.
Repotting: Repotting every 2-3 years. As it is especially prone to rot under-pot in a smaller container filled with very porous compost. Use pot with good drainage. All species of this genus are happy in small pots.
Exposure: It grows best in a partially shaded position. It got sunburned if exposed to midday sun. I would not advise that any Adromischus be grown in shade, as they soon become atypical in this condition.
Hardiness: Requires a minimum temperature 5°C (But hardy down to -7°C for short periods), with good drainage and dryness in winter to resist the cold.
Watering: It takes more water than cacti, but let the soil dry between soaking, in the wild, it receives rain mostly in spring and fall. Must have very dry atmosphere. Water less in winter but do not allow it to shrivel.
Pest & disease: It is vulnerable to mealybugs and rarely scale. It is prone to rotting from the tuberous base or from dried inflorescences. If the plants are not watered and “aired” correctly, fungicides won't help all that much.
Maintenance: As the plant matures, the centre becomes bare. When it does, restart it from side cuttings and throw away the central part. Remove flower spikes before winter.
Propagation: Usually propagate from single leaves (leaf cuttings) or stem cuttings seed propagation is rarely used. Leaves easily root and produce new plants. Twist off a leaf and permit it to dry out a couple of days, lay it on the soil and insert the stem end partially into the soil. The original leaf should not be removed until it has dried up. Try to keep the leaf somewhat upright so that the roots are able to grow downward. If grown in a container, bottom watering by immersing the container is recommended.
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