Botany 1.5:
Intro to Plant Families
Jiling Lin (2017)
www.LinJiling.blogspot.com
9 common
herbaceous plant families:
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Asteraceae
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Brassicaeae
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Lamiaceae
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Apiaceae
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Fabaceae
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Rosaceae
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Malvaceae
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Solanaceae
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Ranunculaceae
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Pinaceae
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Fagaceae
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Betulaceae
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Salicaceae
(I would like to add photos to this one day, but this handout is meant to accompany a class with live plants. Go meet your local herbalists and botanists!)
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9 Plant Families
Asteraceae (Aster family)
Infl: head, with ray (irregular) and/ or disk flowers (regular,
5-merous), usu subtended by involucre of bracts (phyllaries)
K: absent, or with pappus/ bristles/ awns/ scale
C: 5 fused petals
A: 5 fused stamen
G: inferior
Ex: Achillea, Echinaceae, Calendula, Arnica,
Arctium, Artemisia, Taraxacum, Inula, Matricaria…
Brassicaeae (Mustard family)
K: 4 sepals
C: 4 petals
A: tetradynamous (4 long, 2 short)
G: superior, with 2 united carpels
Fruit: dry pod, usu dehiscent: Silique/ silicle
Ex: Brassica (Broccoli, Cabbage,
Cauliflower, Kale, Bokchoy, Turnip), Radish, Horseradish…
Lamiaceae (Mint family)
K: 5-lobed or cleft, regular or bilabiate. 5 united sepals
C: irregular (bilabiate/ 2-lipped); 5 united petals
A: 4 (usu didynamous)
G: superior. 2 united carpels
Lvs: opposite, aromatic
Stems: square
Fruit: capsule with 4 smooth nutlets
Ex: Mentha, Scutellaria, Lavandula, Salvia,
Stachys, Leonurus, Melissa, Ocimum, Nepeta, Monarda…
Apiaceae (Carrot family)
Infl: simple/ compound umbel
K: small, scale-like, 5, or none
C: 5 petals
A: 5 stamen
G: inferior, with 2 united carpels, 2 styles.
Stem: hollow between nodes
Lvs: pinnately compound
Fruit: indehiscent, hard schizocarp, usu oily/ aromatic
Ex: Ligusticum, Foeniculum, Angelica, Centella,
Osmorhiza, Daucus, Conium, Heracleum…
Fabaceae (Pea family)
C: irregular, papilonaceous: banner, wings, keel (5
united sepals)
Lvs: pinnately compound
Fruits: dehiscent pea-like pods
Ex: Trifolium, Astragalus, Glycyrrhiza,
Medicago, Prosopis, Peuraria, Baptisia, Cassia…
Rosaceae (Rose family)
K: 5 separate
C: 5 separate
A: 5 to numerous stamen
G: perigynous. Forms a hypanthium (floral cup). Numerous
styles.
Lvs: serrated alternate leaves with stipules. Simple, trifoliate,
palmate, or pinnately compound.
Ex: Rosa, Crataegus, Prunus, Rubus, Potentilla,
Fragaria, Agrimonia, Alchemilla…
Malvaceae (Mallow family)
K: 3-5 partially united sepals
C: 5 separate petals, regular
A: numerous fused stamen, forming a column
G: superior. Several united carpals.
Lvs: simple, lobed, alternate, often palmately lobed
Ft: schizocarp (cheeses)
Ex: Malva, Hibiscus, Althaea, Theobroma,
Sphaeralcea, Gossypium…
Solanaceae (Nightshade family)
K: 5 united sepals
C: 5 united regular petals
A: 5 stamen attached to petals
G: superior, with 2 united carpels, 1 style, 1
stigma
Lvs: glandular/ sticky, alternate
Ft: berry/ capsule
Ex: Capsicum, Lycium, Solanum, Datura, Hyoscyamus, Atropa, tomato,
potato, eggplant, bellpepper…
Ranunculaceae (Buttercup family)
Variable:
regular/ irregular, perfect/ imperfect
K: 3-15 separate sepals, usu showy
C: usu absent
A: numerous stamen; free
G: superior, 3-numerous simple pistils, usu with
hooked tips
Ex: Anemone, Coptis, Hydrastis, Actaea,
Clematis, Aconitum…
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4 Tree Families
Pinaceae (Pine family)
Gymnosperm,
with aerodynamically matched male and female strobili
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Pine
(Pinus): 1-8 needles sheathed
together at the base
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Larch
(Larix): deciduous. Needles in
spirals at branch buds
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Spruce
(Picea): sharp needles. Cones hang
down
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Fir
(Abies): “furry” flat needles. Cones
points up
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Doug
fir (Tsuedotsuga): cones hang down,
with “mouse tails” between scales
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Hemlock
(Tsuga): short, flat needles attached
by petiole
Fagaceae (Beech family)
Monoecious
K: 4-6 sepals
C: 0
A: 4-40 stamen (on staminate fls)
G: inferior ovary. 3 (sometimes 6) united carpels,
and styles
Lvs: simple, alternate, toothed/ lobed
Ft: acorn-like nut
Ex: Castanea, Quercus
Betulaceae (Birch family)
Monoecious,
with catkins.
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Staminate
fls:
K: 0-4 sepals
C: 0
A: 2-20 stamen
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Pistillate
fls:
K/ C: 0
G: inferior. 2 united
carpels/ styles
Lvs: simple, toothed, alternate, pinnately veined
ft: nut or winged seed
Ex: Betula, Alnus
Salicaceae (Willow family)
Dioecious,
with catkins
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Staminate
fls:
A: 2+ stamen
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Pistillate
fls:
G: superior. 2-4 united
carpels/ stigmas
Ft: capsule
Lvs: simple, alternate
Ex: Salix, Populus