Family Molluginaceae

Molluginaceae Hutchinson

~ Aizoaceae

Including Adenogrammataceae Nak., Limeaceae Shipunov ex Reveal, Polypodaceae Nak.

Habit and leaf form. Herbs, or shrubs (or subshrubs); non-laticiferous and without coloured juice. Plants non-succulent. Annual to perennial. Mesophytic, or xerophytic (?). Leaves alternate, or whorled; non-sheathing; simple; epulvinate. Lamina entire. Leaves stipulate, or exstipulate. Stipules caducous, or persistent. Leaves without a persistent basal meristem.

Leaf anatomy. Stomata present; anomocytic.

Lamina dorsiventral, or isobilateral, or centric.

Stem anatomy. Nodes unilacunar. Internal phloem absent. Secondary thickening anomalous; via concentric cambia. ‘Included’ phloem absent. Xylem with vessels. Vessel end-walls simple. Sieve-tube plastids P-type; type III (a).

Reproductive type, pollination. Plants hermaphrodite (usually), or monoecious.

Inflorescence, floral, fruit and seed morphology. Flowers solitary, or aggregated in ‘inflorescences’; when aggregated, in cymes. The ultimate inflorescence unit cymose. Flowers small; regular; cyclic. Free hypanthium absent. Hypogynous disk present, or absent; when present, annular.

Perianth with distinct calyx and corolla, or sepaline (the petals small or absent); 4–10; 1 whorled, or 2 whorled. Calyx 5 (usually), or 4 (Polpoda); 1 whorled; polysepalous (usually), or gamosepalous (basally joined in Coelanthum). Calyx lobes markedly longer than the tube. Calyx regular; persistent; imbricate. Corolla when present, 5 (small); 1 whorled; polypetalous (usually), or gamopetalous (connate below into a tube in Orygia and Corbichonia); regular.

Androecium (2–)5–10(–25). Androecial members branched, or unbranched; free of the perianth; free of one another, or coherent (at the base of the filaments); 1 adelphous, or 5 adelphous (?); 1 whorled, or 2 whorled. Stamens (2–)5–10(–25); reduced in number relative to the adjacent perianth, or isomerous with the perianth, or diplostemonous to polystemonous. Anthers dehiscing via longitudinal slits; introrse; tetrasporangiate. Endothecium developing fibrous thickenings. Anther epidermis persistent. Microsporogenesis simultaneous. The initial microspore tetrads tetrahedral, or isobilateral, or decussate. Anther wall of the ‘monocot’ type. Pollen grains aperturate; 3 aperturate; colpate; spinulose; 3-celled.

Gynoecium (1–)2–5(–10) carpelled. Carpels reduced in number relative to the perianth, or isomerous with the perianth, or increased in number relative to the perianth. The pistil 2–5 celled. Gynoecium monomerous (Adenogramma), or syncarpous; of one carpel (Adenogramma), or synovarious, or synstylovarious (Glinus); superior. Carpel in Adenogramma fully closed; apically stigmatic; 1–12 ovuled (?). Ovary plurilocular; 2–5 locular. Gynoecium stylate. Styles 1, or 3–5; free; apical. Stigmas papillate. Placentation axile. Ovules 1–25 per locule (?); arillate, or non-arillate; campylotropous (usually), or hemianatropous (almost); bitegmic; crassinucellate. Polar nuclei fusing prior to fertilization. Antipodal cells formed; 3; not proliferating; ephemeral, or persistent (Limeum). Endosperm formation nuclear.

Fruit non-fleshy; dehiscent (usually), or indehiscent; a capsule (usually). Capsules loculicidal (or by transverse slits). Seeds non-endospermic. Perisperm present. Seeds with starch. Embryo well differentiated. Cotyledons 2. Embryo achlorophyllous (1/1); curved. The radicle dorsal.

Physiology, biochemistry. Cyanogenic, or not cyanogenic. Betalains absent. Saponins/sapogenins present, or absent. Aluminium accumulation not found. C3, or C3-C4 intermediate. C3 physiology recorded directly in Glinus, Limeum, Mollugo, Orygia. C3-C4 intermediacy in Mullugo nudicaulis, M. verticillata. Anatomy C4 type (Glinus, Mollugo, Trianthema), or non-C4 type (Glinus, Limeum, Mollugo, Pharnaceum).

Geography, cytology. Holarctic, Paleotropical, Neotropical, and Cape. Temperate to tropical. Mainly tropical and subtropical. X = 9.

Taxonomy. Subclass Dicotyledonae; Crassinucelli. Dahlgren’s Superorder Caryophylliflorae; Caryophyllales. Cronquist’s Subclass Caryophyllidae; Caryophyllales. APG 3 core angiosperms; core eudicot; Superorder Caryophyllanae; Order Caryophyllales.

Species about 100. Genera 15; Adenogramma, Coelanthum, Corbichonia, Corrigiola, Glinus, Glischrothamnus, Hypertelis, Limeum, Macarthuria, Mollugo, Pharnaceum, Polpoda, Psammotropha, Suessenguthiella, Telephium.

Illustrations.
• Technical details: Telephium.