* Petals four Jive or more.
(81) Spiraea - calyx five-cleft; stamens numerous, inserted along with the petals on a disk adhering to the calyx; follicles usually distinct.
†† Fruit composed of numerous (rarely 1-2) small nuts or drupes (one-seeded) invested by a dry calyx.
‡ Fruit and receptacle both dry.
§ Calyx with external bracts, i.e. in two rows.
(83) Sibbaldia - calyx ten-parted, in two rows; stamens five; styles withering; fruits five to ten.
(84) Geum - calyx ten-cleft, in two rows; stamens numerous; fruits numerous, tipped with the persistent jointed styles, hooked at the joint.
§§ Calyx without external bracts.
(85) Dryas - calyx 8-9-cleft, in one row; stamens numerous; fruits numerous, tipped with the persistent hairy styles, which are straight at the extremity.
(86) Agrimonia - calyx five-cleft, the tube turbinate, armed with hooked bristles above, and contracted at the throat; stamens fifteen, inserted with the petals into a glandular ring in the throat of the calyx; nuts two, included in the dry tube of the calyx; style terminal.
‡‡ Fruit dry, receptacle succulent.
(87) Fragaria - calyx ten-parted, in two rows; stamens numerous; receptacle large, succulent, pulpy, deciduous; style lateral near the base of the nut.
‡‡‡ Fruit succulent, receptacle dry or spongy.
(88) Rubus - calyx concave or flattish, five-parted; stamens numerous; styles nearly terminal; carpels numerous, succulent, drupaceous, placed upon a spongy receptacle.
††† Fruit formed of numerous small dry nuts enclosed in the fleshy tube of the calyx, ivhich is contracted at the orifice.
(89) Rosa - calyx urceolate, contracted at the mouth, ultimately fleshy, five-cleft; stamens numerous, inserted with the petals on the rim of the tube of the calyx.
** Petals none. † Stamens four.
(90) Sanguisorba - calyx four-cleft, with two or three external scales at its base, the tube quadrangular; stamens four, opposite to the segments of the calyx.
†† Stamens from twenty to thirty.
(91) Poterium - flowers monoecious or polygamous; calyx fourcleft, with three external scales at its base, the tube quadrangular.
* Stamens as many as the petals, alternating with them.
(92) Tillaea - sepals, petals, stamens, and carpels three or four.
** Stamens twice as many as the petals, and opposite to them.
(94) Sedum - sepals and petals five, rarely four, distinct; stamens ten, rarely eight; hypogynous scales entire.
(95) Sempervivum - sepals and petals 6-20, usually 10-12; stamens twice as many; hypogynous scales laciniated.