R

Question 1

Raceme

Answer 1

an inflorescence of stalked flowers in which the main axis continues to grow. The terminal flower is therefore the last to be dew loped.

Question 2

Radical

Answer 2

arising from the base of the stem - as of leaves

Question 3

Radiate

Answer 3

standing on and spreading from a common centre; a flower-head of the Asteraceae, which has ligulate (strap-shaped) flowers (ray florets) on the circumference and tubular flowers (disc florets) in the centre

Question 4

Ray

Answer 4

all the ligulate (strap-shaped) flowers in the capitulum of Asteraceae

Question 5

Ray florets

see ligule

Answer 5

the ligulate or strap-shaped flowers of the outer florets (or sometimes all the florets) in heads of Asteraceae

Question 6

Receptacle

Answer 6

the swollen head of the flower-stalk (floral axis. torus or thalamus) on which the parts of a single flower are arranged. It is very variable. In some Proteaceae, Leguminosae and Caryophyllaceae it may be lengthened into a short stalk supporting the ovary. In many of
the Rosaceae. Myrtaceae and Thymelacaceae it is frequently hollowed out into a cup enclosing
the ovary, while the stamens, petals and sepals grow from the rim. In some members of
the Asteraceae it is the expanded apex of the peduncle on which the flowers are inserted and
surrounded by an involucre of bracts ( capitulum ).

Question 7

Reflexed

Answer 7

abruptly bent or turned downward or backwards

Question 8

Regular

Answer 8

as of flowers when the various parts, particularly the petals, are evenly spaced.

Question 9

Reniform

Answer 9

kidney-shaped (as of leaf).

Question 10

Resinous

Answer 10

sticky with an exudate of resin

Question 11

Resupinate

Answer 11

bent back or upside down

Question 12

Reticulate

Answer 12

applied to the venation of a leaf when the veins cross like the mesh of a net

Question 13

Retrorse

Answer 13

bent or turned over backwards or downwards

Question 14

Retuse

Answer 14

the end rounded and slightly dented

Question 15

Revolute

Answer 15

when the edges of the leaves are rolled backwards towards the midrib

Question 16

Rhachilla

Answer 16

the rhachis of the spikelets in grasses

Question 17

Rhachis

Answer 17

the axis bearing flowers or leaflets. i.e. the main stem of an inflorescence and the petiole of a compound leaf

Question 18

Rhizome

Answer 18

an underground creeping stem which grows more or less horizontally

Question 19

Rhomboidal

Answer 19

diamond shaped

Question 20

Rim

Answer 20

the upper edge of the fruit. as in Eucalyptus.

Question 21

Rosette

Answer 21

an arrangement of leaves in a circular form in which they radiate from a centre, and are usually on or close to t he ground

Question 22

Rostellum

Answer 22

an extension of the upper edge of the stigma in orchids

Question 23

Rostrate

Answer 23

beaked

Question 24

Rosulate

Answer 24

in rosettes

Question 25

Rotate

Answer 25

wheel-shaped (as in corolla)

Question 26

Rudimentary

Answer 26

as of ovary or stamens. imperfectly developed. usually reduced in size and non-functional: e-.g. some mail’ flowers in the Euphorbiaceae have rudimentary ovaries

Question 27

Rugose

Answer 27

wrinkled

Question 28

Runcinate

Answer 28

a pinnatifid leaf with lobes pointing towards the base