The families of flowering plants
~ Elaeocarpaceae, Tiliaceae.
Habit and leaf form. Small to medium trees and shrubs. Plants non-succulent. Leaves alternate; distichous; petiolate; non-sheathing; simple. Lamina entire; basally conspicuously asymmetric to not conspicuously asymmetric; palmately veined; cross-venulate; asymmetrically cordate. Leaves stipulate (at least in Muntingia and Dicraspidia). Stipules intrapetiolar; free of one another (or one missing); on the plagiotropic branches of Muntingia and Dicraspidia peculiar: in the former, the upper stipule of each leaf is narrow and the lower is lacking, while in the latter the upper is large, peltate and leaflike while the lower is filiform. Lamina margins serrate. Leaf development not graminaceous.
Leaf anatomy. The leaf lamina dorsiventral. Hairs present; eglandular and glandular (in combination); multicellular. Unicellular hairs branched and simple (in combination). Multicellular hairs branched and simple. Complex hairs present; stellate. Lamina without secretory cavities. The mesophyll not containing mucilage cells.
Axial (stem, wood) anatomy. Secretory cavities absent. Cork cambium present. Secondary thickening developing from a conventional cambial ring.
The wood semi-ring porous to diffuse porous. The vessels without vestured pits. The axial xylem with fibre tracheids. The parenchyma apotracheal; wood partially storied (VPI, Muntingia).
Reproductive type, pollination. Plants hermaphrodite. Floral nectaries present. Nectar secretion in Muntingia from the disk (from behind the filaments at the base of the ovary). Pollination entomophilous; via hymenoptera (Muntingia, by bees).
Inflorescence, floral, fruit and seed morphology. Flowers solitary, or solitary and aggregated in inflorescences (both solitary and in few-flowered clusters in Muntingia); displaced axillary. Inflorescences displaced axillary (the flower- or inflorescence-subtending leaf subtending a vegetative bud as well: cf. Tiliaceae). Flowers medium-sized to large (relatively large); regular; cyclic, or partially acyclic (?). The androecium acyclic (?). Floral receptacle developing an androphore, or with neither androphore nor gynophore (?). Free hypanthium absent. Hypogynous disk present; annular.
Perianth with distinct calyx and corolla; (8–)10(–14); 2 whorled; isomerous. Calyx (4–)5(–7); 1 whorled; basally gamosepalous; blunt-lobed, or toothed; regular; non-fleshy; persistent, or not persistent; non-accrescent; valvate (the tips free in Muntingia). Corolla (4–)5(–7); 1 whorled; polypetalous (the petals exceeding the calyx); imbricate and crumpled in bud; regular; white, or pink, or yellow (Dicraspidia and Neotessmannia); deciduous (thin). Petals with irregular margins.
Androecium (11–)15–100 (many). Androecial members branched (many and free or almost so, suggesting trunk bundles .....); maturing centrifugally; free of the perianth; free of one another, or coherent (tending to be bundled?). Stamens (11–)15–100 (many); polystemonous. Anthers more or less basifixed, or dorsifixed; versatile, or non-versatile; dehiscing via short slits (at least sometimes, in Neotessmannia and Dicraspidia?), or dehiscing via longitudinal slits. Microsporogenesis simultaneous. Tapetum glandular. Pollen shed in aggregates (Neotessmannia), or shed as single grains; when shed in aggregates, in tetrads. Pollen grains 2-celled.
Gynoecium 5 carpelled, or 6–7 carpelled. Carpels isomerous with the perianth, or increased in number relative to the perianth (?). The pistil 5–35 celled (? to many-celled via false septa). Gynoecium syncarpous; eu-syncarpous; superior (Muntingia), or partly inferior (Dicraspidia), or inferior (Neotessmannia). Ovary 5–7 locular (at least below). Locules secondarily divided by false septa (commonly), or without false septa. Gynoecium non-stylate (almost, in Muntingia), or stylate. Styles 1 (thick); apical. Stigmas 1 (decurrent or lobed-sulcate); 1 lobed, or 5–7 lobed. Placentation apical (the placentas pendulous and free from the apices of the locules, lobed). Ovules differentiated; 25–50 per locule (many); pendulous; epitropous; with ventral raphe; anatropous; bitegmic; crassinucellate. Outer integument contributing to the micropyle. Endothelium differentiated. Endosperm formation nuclear. Embryogeny onagrad.
Fruit fleshy; indehiscent; a berry; 25–100 seeded (many, the seeds embedded in pulp). Seeds endospermic; small. Cotyledons 2. Embryo straight.
Physiology, phytochemistry. Sugars transported as sucrose (Muntingia).
Geography, cytology. Neotropical. Tropical. Neotropical, with Muntingia introduced elsewhere.
Taxonomy. Subclass Dicotyledonae; Crassinucelli. Dahlgrens Superorder Malviflorae; Malvales. Cronquists Subclass Dilleniidae; Violales. APG 3 core angiosperms; core eudicot; Superorder Rosanae; malvid; Order Malvales.
Species 3. Genera 3; Dicraspidia, Muntingia, Neotessmannia.
General remarks. Cf. the incomplete and fairly unsatisfactory descriptive data provided by Bayer et al. (1998), here supplemented for esoteric characters from the usual sources (see References). Neotessmannia is poorly known, and is now dubiously associated with the other two genera, which have long been acknowledged as anomalous members of Elaeocarpaceae or Tiliaceae (even referred to Flacourtiaceae by Cronquist). The displaced-axillary flower and inflorescence buds are less peculiar than Bayer et al. seem to suggest: see Rendle 1930 for discussion and interpretation of the bud pairs in Tiliaceae.
Economic uses, etc. Edible fruit from Muntingia, which is cultivated as an ornamental.
Illustrations. • Muntingia calabura: Bot. Mag. 98 (1872).
We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, distributions of character states within any set of taxa, geographical distribution, genera included in each family, and classifications (Dahlgren; Dahlgren, Clifford, and Yeo; Cronquist; APG). See also Guidelines for using data taken from Web publications.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 1992 onwards. The families of flowering plants: descriptions, illustrations, identification, and information retrieval. Version: 30th September 2017. delta-intkey.com/angio’.