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The families of flowering plants

L. Watson and M.J. Dallwitz

Alstroemeriaceae Dum.

~ Former Liliaceae

Excluding Luzuriagaceae

Habit and leaf form. Herbs. Plants green and photosynthesizing. Perennial; without conspicuous aggregations of leaves; rhizomatous and tuberous (some of the roots being modified to store water and nutrients). Self supporting, or climbing; when climbing, stem twiners. Mesophytic. Leaves medium-sized; alternate; spiral; flat; petiolate; non-sheathing; simple. Lamina generally inverted; entire; linear to lanceolate; parallel-veined; without cross-venules; attenuate to the base. Lamina margins entire.

Leaf anatomy. The leaf lamina dorsiventral. Stomata present; anomocytic. Guard-cells not ‘grass type’. The mesophyll containing crystals. The crystals raphides (abundant). Foliar vessels absent. Minor leaf veins without phloem transfer cells (Alstroemeria).

Axial (stem, wood) anatomy. Cork cambium absent. Secondary thickening absent.

The vessel end-walls horizontal; scalariform.

Root anatomy. Roots without velamen. Root xylem with vessels; vessel end-walls scalariform, or scalariform and simple (mainly scalariform).

Reproductive type, pollination. Plants hermaphrodite. Floral nectaries present. Nectar secretion from the perianth (from the bases of two or all of the inner tepals).

Inflorescence, floral, fruit and seed morphology. Flowers solitary (rarely), or aggregated in ‘inflorescences’; in cymes, or in umbels. The ultimate inflorescence units cymose. Inflorescences terminal; umbelliform, helicoid cymes. Flowers bracteate (the bracts leaflike); medium-sized; regular to somewhat irregular; sometimes slightly zygomorphic; 3 merous; cyclic; pentacyclic. Perigone tube present, or absent.

Perianth with distinct calyx and corolla, or of ‘tepals’; 6; mostly free; 2 whorled (3+3); isomerous; petaloid, or sepaloid and petaloid; spotted; similar in the two whorls to different in the two whorls (the outer whorl often shorter, of different colour and less variegated); green, or orange, or red, or pink; deciduous.

Androecium 6. Androecial members free of the perianth; free of one another; 2 whorled (3+3). Androecium exclusively of fertile stamens. Stamens 6; diplostemonous; alterniperianthial. Anthers (pseudo-) basifixed, or dorsifixed; non-versatile; dehiscing via longitudinal slits; introrse. The endothecial thickenings spiral. Microsporogenesis successive. Tapetum glandular. Pollen shed as single grains. Pollen grains aperturate; 1 aperturate; sulcate; 2-celled.

Gynoecium 3 carpelled. Carpels isomerous with the perianth. The pistil 1 celled, or 3 celled. Gynoecium syncarpous; synstylovarious; inferior. Ovary 1 locular, or 3 locular. Styles 1; apical. Stigmas 3; wet type. Placentation when unilocular, parietal; when trilocular, axile. Ovules in the single cavity 20–100 (‘many’); 20–100 per locule (‘many’); non-arillate; anatropous; bitegmic; tenuinucellate. Outer integument not contributing to the micropyle. Endothelium differentiated. Embryo-sac development Polygonum-type. Synergids beaked. Endosperm formation nuclear.

Fruit fleshy (sometimes), or non-fleshy; dehiscent (usually, occasionally explosively so), or indehiscent; a capsule (usually), or capsular-indehiscent, or a berry. Capsules when dehiscent, loculicidal. Fruit elastically dehiscent, or passively dehiscent. Seeds endospermic. Endosperm oily. Seeds without starch. Embryo well differentiated. Cotyledons 1 (not coleoptile-like). Embryo straight. Testa without phytomelan.

Seedling. Hypocotyl internode present (short). Seedling collar not conspicuous. Cotyledon hyperphyll elongated, or compact; assimilatory (when elongated), or non-assimilatory. Coleoptile absent. Seedling cataphylls present. First leaf dorsiventral. Primary root persistent.

Physiology, phytochemistry. Not cyanogenic. Alkaloids absent. Saponins/sapogenins probably present. Proanthocyanidins absent. Flavonols present; kaempferol and quercetin. Ellagic acid absent. Sieve-tube plastids P-type; type II.

Geography, cytology. Neotropical and Antarctic. Central and South America. X = 8, 9.

Taxonomy. Subclass Monocotyledonae. Dahlgren et al. Superorder Liliiflorae; Liliales. APG III core angiosperms; Superorder Lilianae; non-commelinid Monocot. APG IV Order Liliales.

Species 200. Genera 4; Alstroemeria, Bomarea, Leontochir, Schickendantzia.

General remarks. The compiled descriptions show numerous, conspicuous differences between this family and Luzuriagaceae (q.v.).

Illustrations. • Alstroemeria aurantiaca: Bot. Reg 1843, 1836. • Alstroemeria ligtu: Bot. Reg. 1839, 13. • Alstroemeria, Bomarea: Chittenden. • Bomarea ovallei, as Leontochir: Hook. Ic. Pl. 14 (1880–82). • Bomarea ovata, as Alstroemeria densiflora: Bot. Mag. 91 (1865).

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: 15th April 2018.’.