An Integrated System of Classification of Flowering Plants by Arthur Cronquist

By Arthur Cronquist

-- Natural History

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Flowering Plants. Dicotyledons: Lamiales (except Acanthaceae including Avicenniaceae)

During this quantity, 24 flowering plant households comprising a complete of 911 genera are handled. They symbolize the asterid order Lamiales with the exception of Acanthaceae (including Avicenniaceae), in an effort to be integrated in a later quantity. even if lots of the constituent households of the order were well-known as being heavily similar in the past, the inclusion of the households Byblidaceae, Carlemanniaceae and Plocospermataceae is the end result as a rule of contemporary molecular systematic learn.

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Pores and, in some species, spiral fibrils often found in the stem and branch cortex. Antheridia solitary on leaf axils; ± unspecialised branches, globose, with a narrow stalk of 2–4 rows of cells. After fertilisation the perichaetial leaves grow rapidly, but the pseudopodium elongates only at maturity. Spore discharge is by an ‘airgun’ mechanism, the ripe capsule shrinking in dry weather to build up an internal pressure, reputedly 4–6 atmospheres, blowing off lid and ejecting the spores several centimetres into the air.

Oedipodium (p. 0 cm high, leaves not constricted at or below middle, hair-points if present smooth, gemmae lacking, laminal KOH reaction yellow 64. Tortula (p. 0 cm high, hyaline points if present denticulate or if smooth then leaves contracted at or below middle, gemmae sometimes present on adaxial side of leaves or stem tips or rhizoids, laminal KOH reaction red 72. Syntrichia (p. 380) 91 Leaf cells longer than wide 92 Leaf cells ± isodiametric 94 92 Leaves imbricate when moist, cells rectangular 29.

700) 220 Costa single, extending 1/2–3/4 way up leaf, mid-leaf cells 3–4 times as long as wide 143. Homalia (p. 722) Costa very short or if not then double, cells 4–20 times as long as wide 221 221 Stems pinnately branched, branches spreading 142. Neckera (p. 719) Stems irregularly branched, branches not spreading 267 34 Artificial key to the genera 222 Leaves abruptly narrowed to long apiculus from ovate to wider than long basal part 223 Leaf apices obtuse to rounded, apiculus if present short 228 223 Costa single, extending half way or more up leaf 224 Costa short or absent 226 224 Stems usually regularly pinnately branched, leaves imbricate when moist, plicate 183.

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