☰ Contents · Botany

Rose and Cabbage (Mustard) Families

Lessons 47–48 · 2 lessons · O. Pratov, A. Tukhtaev, F. Azimova, I. Saparboev, M. Umaraliyeva. Biology (Botany), Grade 6. O‘zbekiston Publishing House, Tashkent, 2017
48

Cabbage family (Brassicaceae)

Textbook: pp. 115–116
GoalState the features, flower formula, fruits and representatives of the mustard (cabbage) family.
New words
mustard family (Brassicaceae, cabbage family) · karamdoshlar (Brassicaceae)raceme · shingilsilique / silicle (pod-like fruit) · qo‘zoq / qo‘zoqchashepherd’s purse (Capsella bursa-pastoris) · jag‘-jag‘
Explanation

The mustard (cabbage) family grows on almost every continent and has about 3000 species, mostly annual, biennial and perennial herbs. It has a taproot, simple leaves without stipules arranged alternately. Flowers are regular and bisexual, in a raceme. Flower formula: K4 C4 A2+4 G(2) — 4 free sepals, 4 free petals (cross-shaped, hence the old name Cruciferae), 6 stamens (4 long and 2 short) and one pistil formed from two carpels. The fruit is a silique (length at least 3 times the width) or a silicle (length equal to or up to 2 times the width), usually opening from the base into two valves. Shepherd’s purse is an annual herb 10–30 cm tall; it flowers from March to May and has triangular silicles; its leaf rosettes are eaten in early spring (green dumplings and pies) and contain vitamins C and K. Crops: cabbage, turnip, radish and black radish; woad (o‘sma) gives a dye. Eight species of this family are in the Red Book of Uzbekistan. Do not use wild plants as medicine on your own.

Flower of the cabbage family (cross-shaped)
PartNumberFeature
Sepals4free
Petals4free, in a cross
Stamens2+44 long, 2 short
Pistil1fused from 2 carpels
Worked examples
Radish flower: K4 C4 A2+4 G1 — 4 cross-shaped petals, 6 stamens, fruit a silique.
Shepherd’s purse has a silicle (triangular); cabbage, turnip, radish and black radish are vegetables; woad is a dye plant.
Class activity

Comparison: take flowering or fruiting shoots of shepherd’s purse from near school, or radish/turnip from the market; find the 4 petals, 6 stamens and the silique or silicle and draw them. Safety: pick weeds with an adult; do not eat plants from roadsides or sprayed areas; wash hands.

Practice
1
Write the flower formula of the cabbage family.
2
What is the difference between a silique and a silicle?
3
If a flower has 4 long and 2 short stamens, how many in all? (4 + 2)
4
Why is shepherd’s purse common in spring but scarce in summer?