20 
Sixth, seventh class. 
28. FIs white or yellowish . . . Ornithogalum. 587. 
— FIs blue. Scilla. 589. 
29(7). FIs on a spadix ...... SO 
— FIs in a panicle. Juncaceee ..... 31 
30 Perianth 0. Ls cordate .... Calla. 539. 
— Perianth present. Ls ensiform . . Acorus. 540. 
31. Caps. 1-celled, 3-seeded. Ls grass-like, gen. ciliate 
Luzula. 598. 
— Caps, more or less completely 3-celled, many-seeded. 
Ls setaceous, cylindric or 0, glabr. . Juncus. 597. 
32 (1). Styles numerous. Ls radical . . Alisma. 527. 
— Styles 2—3 ........ S3 
33. Floral envelope composed of cal. and cor. Ls opp. Pis 
growing near water .... Elatine. 112. 
— FI. envelope simple (a perianth) . . . 31 
34. Perianth with an elongated tube springing from the bulb 
Colchicum. 594. 
— Perianth without the elongated tube . . . 33 
35. Ls net-veined. Dicotyledons ..... 36 
— Ls with straight or curved veins. Monocotyledons 38 
36. Stigs capitate. Lobes of the perianth coloured, almost 
equal. . . Polygonum. 493. 
— Stigs tufted, stellate. Lobes of the perianth herbaceous 
or scarious, the 2 or 3 inner ones enlarged when mature 
37 
37. Styles 2. Perianth 4-partite. Fr. lenticular, compressed, 
with broad wings ..... Oxyria. 492. 
— Styles 3. Perianth 6-partite. Fr. 3-cornered, not winged 
Rumex. 491. 
38(35). Perenn. pis with elliptic, folding-nerved ls, and fls 
in racemes forming a panicle . . Veratrum. 595. 
— Low herbs with grass-like ls, and fls in simple racemes 
39 
39. Ovary narrowed into the style. Ls distichous, sheathing 
on opp. sides. Tofieldia. 596. 
— Styles 0. Stig. sessile. Marsh pis .... 40 
40. Carps united only at the base. Stem leafy 
Scheuchzeria. 530. 
— Carps united throughout their whole length. Ls all 
radical. Triglochin. 531. 
Cl. 7. Heptandria. 
1. Styles 2. Fls yellow. Fr. an achene Agrimonia. 173. 
— Style 1. Fr. a capsule . . . . . 2 
2. Fls yellow . . . • . . Lysimachia. 469. 
— Fls white. Trientalis. 468. 
