Morphology & Anatomy of Flowering Plants: Key Numbers & Data

7 — Number of important plant families covered: Fabaceae, Solanaceae, Liliaceae, Malvaceae, Brassicaceae, Asteraceae, Poaceae.
9+1 — Diadelphous stamens in Fabaceae: 9 filaments fused + 1 free (epipetalous on standard side).
4+2 = 6 — Tetradynamous stamens in Brassicaceae: 4 long + 2 short.
6 — Total stamens in Liliaceae (3+3 whorls, equal in length).
3 — Number of stamens per floret in Poaceae (with versatile anthers).
3+3 — Tepals in Liliaceae: 3 sepals + 3 petals, all coloured (hence called tepals).
5 — Number of petals/sepals in Fabaceae, Solanaceae, Malvaceae, Brassicaceae (but Brassicaceae = 4 not 5!).
4 — Petals and sepals in Brassicaceae (cruciform: 4 petals arranged in a cross).
2 — Carpels in Solanaceae and Brassicaceae (bicarpellary syncarpous ovary).
1 — Carpel in Fabaceae (monocarpellary, marginal placentation, legume forms from single carpel).
2 — Cotyledons in dicot seeds (e.g., gram); 1 cotyledon (scutellum) in monocot seeds (e.g., maize).
2–4 — Xylem bundles (xylem poles) in dicot roots.
>6 — Xylem poles in monocot roots (polyarch condition).
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2 — Lodicules per floret in Poaceae (vestigial perianth scales).
5 — Placentation types: marginal, axile, parietal, free central, basal.
3 — Types of simple permanent tissues: parenchyma, collenchyma, sclerenchyma.
4 — Living components in vascular tissue: xylem parenchyma, sieve tubes, companion cells, phloem parenchyma.
2 — Dead tissue types in vascular system: xylem vessels + tracheids (both dead at maturity); xylem fibres also dead.
3 — Types of stem modifications (underground, subaerial, aerial).