SYNOPSIS OF THE NATURAL SYSTEM. 



Sec> I. Classe.i niifl SubcIaHxcs. 



1 Flowering jjlants (PjiiENOGAMiA). 2 



I Flowoiicss plants (CuYnociAMiA). 5 



2 Lvs. net-veined (§ 229, 1). FIs. never wholly trinierou.s (Exogens). 3 

 2 Lvs. parallel- (rarely net-) veined. FIs. trinuruus (Endogen.s). 4 



3 Stigmas present. Sds. enclosed in a pericarn. G ANGIOSPERMS. I 



3 Stig. none. Sds. quite naked. (Conifer.e. CXXXI) GYMNOS PERMS. II 

 4 Sepals and petals vertieillate or 0. Glumes 0. 143 AGLU.MACIIJ!:. Ill 

 4 Sep. and pet. none. Glumes altern. Fr. 1-s'ded. 163 GLUMACE^l!:. IV 



5 Stems and leaves distinguishable. 164 - - - - ACROGENS. V. 



5 Stems and leaves undislinguishable. 168 - - - THALLOGENS. VI 



6 Petals (or petaloid sepals) distinct. 7 Polypetalae. I 



6 Petals united (at least at their bases). 76 - - - - Moiiopetalae. II 

 6 Petals 0. Sepals more or less united or none. 116 - Apetalae. Ill 



Sec. II. Orders of the Polypetalous Exogens. 



7 Herbs (164), annual, biennial or perennial, rarely suffruticose at base. - - 8 



7 Shrubs and trees (164). 54 



8 Leaves alternate or all radical. 9 



8 Leaves cauline, opposite, at least the lower ones. -- --38 



9 Stipules (249) present. 34 



9 Stij)ules none. 10 



10 Polyandrous,— stamens (20— 200) indefinite. 11 



10 Oligandrous, — stamens (few) definite. 17 



II Stamens (hypogynous) inserted on the receptacle (74, 2c?). 12 



11 Stamens (perigynous) inserted on the calyx or corolla. 16 



12 Ovaries simple; fruit acheniate, folliculate, &c.j never capsular. 13 



12 Ovaries united into a compound capsule. 1.5 



13 Leaves never peltate. Seeds albuminous. RANtrNcuLACEiE. 1 



13 Leaves centrally or subcentrally peltate. Aquatic. --------14 



14 Sepalsand petals definite (2 — 4). Seeds albuminous. - - Cabombaceje. VII 

 14 Sepals and petals indefinite, numerous. Albumen 0. - - - Nelumbiace^. VIII 



15 Sepals and petals indefinite, numerous. NyMPH^EACEi:. IX 



15 Sepals and petals 5. Lvs. pitcher- or trumpet-form. - Sarraceniace.e. X 



15 Sepals 2. Juice usually colored. PAPAVERACEi:. XI 



16 Sepals and petals 5 — 10. ---.75 



16 Sepals and petals indefinite and confounded. Cactace^. LXI 



17 Flowers very irregular. 18 



17 Flowers regular or nearly so. 20 



18 Filaments 6 or 8, united below into one or two sets. --- 19 



18 Filaments 5, cohering only at top. BALSAMiNACEiE. XXVIII 



18 Filaments 8, distinct. Leaves peltate. ------ TropjeolacejE. XXIX 



18 Filaments 8, distinct. Lvs. biternate. Vine with tendrils. Sapindaceje. XLIV 



19 Leaves much dissected and divided. FcmariacejE. XII 



19 Leaves simple, entire. Polygalace^. XVI 



20 Ovaries superior (97), free from the calyx or nearly so. 21 



20 Ovaries inferior, or wholly adherent to the calyx (97). 32 



21 Sepals 2. Fleshy herbs. Pobtulacace^. XXIV 



21 Sepals 3 or more. 22 



22 Sta. (hypogynous) inserted on the receptacle or torus. 23 



22 Stamens (perigynous) inserted on the calyx. 31 



23 Sepals, petals and stamens symmetrical (61, c). 24 



23 Sepals, petals and stamens unsymmetrical. Fruit a pod. 29 



24 Carpels solitary, fruit simple, one-celled. Berbehidace^. VI 



24 Carpels 3 — 5, more or less united. ---.-._._ 25 



25 Leaves simple. 26 



25 Leaves compound. 27 



26 Ovary and capsule one-celled. Aquatic. DRosERACEiE. XVIII 



26 Ovary and capsule 5— 10-celled. - - - - Linaceje. XXVI 



27 Plants aquatic. Fr. 2 — 5 fleshy achenia. Juice acid. Limnanthace.e. XXX 



27 Plants not aquatic. 28 



28 Leaves palmately 3-foliate. Juice acrid. ----- Oxalipace.*:. XXXI 



28 Leaves pinnate, with pellucid resinous dots. . - - - Rutace.e. XXXIV 



29 Flowers cruciform (105, 1). Pods 2-carpeled, 2-cellcd. - Crucifeb.e. XIII 



29. Flowers not cruciform. ----- 30 



