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Taxonomy

Genera

Arbutus

Arbutus is a genus of at least 14 species of flowering plants in the family Ericaceae, native to warm temperate regions of the Mediterranean, western Europe, and North America. [more]

At least 122 species and subspecies belong to the Genus Arbutus.

More info about the Genus Arbutus may be found here.

Arctostaphylos

The genus Arctostaphylos, the manzanitas and bearberries, are shrubs or small trees characterised by smooth, orange or red bark and stiff, twisting branches. [more]

At least 417 species and subspecies belong to the Genus Arctostaphylos.

More info about the Genus Arctostaphylos may be found here.

Ardisia

Trees, shrubs, suffrutescent [or rarely herbs]. Leaves alternate or pseudoverticillate, usually punctate or punctate-lineate. Inflorescences paniculate, cymose, corymbose, or umbellate, rarely racemose. Flowers bisexual, often punctate, 5- or rarely 4-merous. Calyx campanulate or cupular; sepals free or barely united at base, imbricate or quincuncial, usually punctate or punctate-lineate. Corolla campanulate, often punctate; lobes united at base, overlapping to right or very rarely to left, imbricate, or quincuncial, often conical in bud. Stamens attached at base or middle of corolla tube; filaments very short, broad at base; anthers dehiscing longitudinally or by apical pores. Ovary ovoid or subglobose, as long as or longer than petals; ovules 3 to many. Style base persistent; stigma minute, apiculate. Fruit drupaceous, 1-seeded, punctate, sometimes longitudinally ribbed, with somewhat fleshy exocarp and crusty or slightly bony endocarp. Seeds covered by membranous remnants of placenta.^[1] [more]

At least 1,492 species and subspecies belong to the Genus Ardisia.

More info about the Genus Ardisia may be found here.

Arenaria

Herbs annual or perennial, rarely biennial. Stems erect or rarely creeping, often caespitose or pulvinate. Leaves opposite, rarely whorled; leaf blade linear to elliptic, ovate, or orbicular, usually flat, margin entire. Flowers solitary or numerous in cymes, actinomorphic. Sepals 4 or 5, apex entire, rarely emarginate. Petals 4 or 5, sometimes absent, apex entire to toothed, 2-cleft, or fimbriate. Stamens (2--5 or 8 or) 10. Ovary 1-loculed; ovules numerous. Styles 2 or 3(--5) . Capsule ovoid, obovoid, or globose, usually shorter than persistent sepals, rarely equaling or longer than them, 3- or 6-valved. Seeds reniform or subovoid, flattened, smooth, tuberculate, or narrowly winged.^[2] [more]

At least 1,185 species and subspecies belong to the Genus Arenaria.

More info about the Genus Arenaria may be found here.

Argyranthemum

Subshrubs or shrubs, 10-80+[-150] cm. Stems usually 1, procumbent to erect, usually branched, glabrous [hairy]. Leaves mostly cauline; alternate; petiolate or sessile; blades ± obovate [oblong to lanceolate or linear] (bases sometimes ± clasping), [0](1-) 2-3-pinnately lobed (lobes cuneate to linear), ultimate margins dentate [entire], faces glabrous [hairy]. Heads radiate [discoid], borne singly or in open, corymbiform arrays. Involucres hemispheric or broader, [6-]10-18[-22+] mm diam. Phyllaries persistent, 28-45+ in 3-4 series, distinct, oblanceolate or ovate to lance-deltate or lanceolate (not keeled abaxially), unequal, margins and apices (stramineous to brown) scarious (tips of inner often ± dilated). Receptacles convex to conic, epaleate. Ray florets 12-35+, pistillate, fertile; corollas usually white, sometimes yellow or pink, laminae ± ovate to linear. Disc florets [50-]80-150+, bisexual, fertile; corollas yellow [red, purple], tubes ± cylindric (not basally dilated, ± gland-dotted), throats campanulate, lobes 5, deltate (without resin sacs). Cypselae dimorphic: outer (ray) 3-angled, each angle usually ± winged (wings not spine-tipped) ; inner (disc) compressed-prismatic (± quadrate, sometimes 2 angles winged, wings not spine-tipped) ; all ± ribbed or nerved, faces usually glabrous, sometimes gland-dotted between ribs (pericarps without myxogenic cells or resin sacs; embryo sac development bisporic) ; pappi 0 (cypselar wall tissue sometimes produced as teeth, crowns, or oblique tubes similar in texture to cypselar wings). x = 9.^[3] [more]

At least 355 species and subspecies belong to the Genus Argyranthemum.

More info about the Genus Argyranthemum may be found here.

Bibliography

• Chen Chieh. 1979. Myrsinaceae. Fl. Reipubl. Popularis Sin. 58: 1-147.
• Humphries, C. J. 1976. A revision of the Macaronesian genus Argyranthemum Webb ex Schultz Bip. (Compositae-Anthemideae). Bull. Brit. Mus. (Nat. Hist.), Bot. 5: 147-240.

Footnotes

1. "Ardisia". in Flora of China Vol. 15 Page 10. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.
2. Dequan Lu, Zhengyi Wu, Lihua Zhou, Shilong Chen, Michael G. Gilbert, Magnus Lidén, John McNeill, John K. Morton, Bengt Oxelman, Richard K. Rabeler, Mats Thulin, Nicholas J. Turland & Warren L. Wagner "Arenaria". in Flora of China Vol. 6 Page 40. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.
3. John L. Strother "Argyranthemum". in Flora of North America Vol. 19, 20 and 21 Page 30, 485, 487, 552. Oxford University Press. Online at EFloras.org.

Sources

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