Flowers. xxi 



(f) Petals, four, united. Madder Fam. No. 12 (Rubiaceae), 



page 96. 

 (c) Petals, five, united. Honeysuckle Fam. No. 11 (Capri- 

 foliaceae), page 87. 

 2. Sepals not attached to the seed-case. 

 {a) Corolla irregular. 



(6) Prostrate ; flowers blue. Gill-over-the-Ground in Mint 



Fam. No. 21 (Labiatae), page 152. 

 (l>) Climbing ; flowers scarlet. Trumpet-Creeper in Bignonia 

 Fam. No. 20 (Bignoniaceae), page 151. 

 (a) Corolla regular. 



(b) Stamens of the same number as the united petals. 



(c) Seed-cases, two ; separate. Milkweed Fam. No. 



17 (Asclepiadaceae), page 124. 

 (c) Seed-case one. 



(d) Stamens free from the corolla, but inserted with its 



base. Heath Fam. No. 14 (Ericaceae), page 106. 



(d) Stamens adherent by their sides to the tube of the 



corolla. Pyxie Fam. No. 15 (Diapensiaceas), page 



121. 



(d) Stamens adherent by their bases to the tube of the 



corolla. 



(1?) Seeds few, one or two in each cell. Morning-Glory 



Fam. No. 18 (Convolvulaceae), page 127. 

 (e) Seeds, many. Nightshade Fam. No. 19 (So- 

 lanaceae), page 146. 



Division III. Petals wanting (Apetalous). 



. (a) Seed-case, one, attached to the sepals. Pipe- Vine in Birth- 

 wort Fam. No. 23 (Aristolochiaceae), page 163. 

 (a) Seed-case, one, free from the sepals. 



(&) Leaves alternate. Buckwheat Fam. No. 22 (Poly- 



gonaceae), page 157. 

 {l>) Leaves opposite. Hop in Nettle Fam. No. 24 (Urti- 

 caceae), page 164. 

 (a) Seed-cases, numerous, with single seeds (achenes). Clematis 

 in Crowfoot Fam. No. 1 (Ranunculaceae), page 4. 



Class Second. — Flowers, with the sepals and the petals 

 never in fives — usually in threes. Leaves strongly- 

 veined from base to apex, the veins more or less 



