131 



A SYNOPSIS OF THE NATURAL SYSTEM; 



BEING 



A KEY TO THE CLASSES AND* ORDERS, FOR THE READY ANAL- 

 YSIS OF ANY PLANT EMBRACED IN THIS FLORA. 



1. Classes and Subclasses. 



1 Flowering plants, or PH.ENOGAMIA. ... 2 



I Flowerless plants, or CRYPTOGAMIA. ... 5 



2 Leaves net-veined. Flowers never completely 3-partcd. EXOGEXS. ... 3 

 2 Leaves parallel- (rarely net-) veined. FluweraS-p.trted. EXDOGEXS. ... 4 



3 Stigmas present/ Sds. enclosed in se ; d-vessels 6. AXGIOSPERMS. I. 



3 Stig.O. Sds.nak. (Pine,Fir.c.) CoNiFER^.CXXXI.GYMXOS PERMS. II. 



4 Fls. with no glumes. Perianth whorled or wanting 127. AGLUMACE/E. III. 



4 Fls. with green glumes, no perianth and 1-seededfr 147. GLUMACIw'E. IV. 



5 Stems and leaves distinguishable. . . . 149. ACROGENS. V. 



5 Steins and leaves confounded together. . . . 151. - -THALLOGENS. VI. 



6 Corolla with distinct petals. ... 7 Polypetalous Exogens. I 



6 Corolla with united petals. ... 69 Monopetalous Exogens. 2 



6 Corolla (and often the calyx also) wanting. ... 97 - - Apetolous Exogeus. 3 



2. Or Jers of the Polypetalous Exogens. 



7 Herbs ( 164). ... 8 



7 Shrubs, trees or under-shrubs. ... 48 

 8 Leaves alternate or all radical. ... 9 

 8 Leaves cauline, opposite, at least the lower ones. ... 35 



9 Leaves furnished with stipules. ... 32 



9 Leaves destitute of stipules. ... 10 

 10 Polyandrous stamens 17200, indefinite. ... 11 

 10 Oligandrous stamens few and definite. ... 16 



II Stamens hypogynous situated on the receptacle. ... 12 



11 Stamens perigynous situated on the calyx or corolla. ... 15 

 12 Sepals 35. Leaves centrally peltate, in water. ... 13 

 12 Sepals 39. Leaves neither peltate nor tubular. ... 14 



12 Sepals 5, persistent. Leaves tubular, pitcher-form. - - SARRACENIACE^E. X. 

 12 Sepals 2, deciduous. Juice usually colored. - - - - PAPAVERACE.E. XL 



13 Petals 3 or 4, in one row. Lvs. oval, floating. - - CABOMBACE.E. VII. 



13 Petals many, in several rows:. Lvs. round, erect. - NELUMBIACEJE. VIII. 

 14 Pistils (or pistil) simple and distinct, few or many. - - - RANUNCULACEJE. I. 

 14 Pistil compound, large 12 30-ceiled. (In water.) - - - NYMPH.KACEJE. IX. 



15 Petals 5. Styles several, distinct. ROSACES. XLVIII. 



15 Petals 5. Styles united into one. ------- LOASACE.E. LVI. 



15 Petals numerous, in several rows. Styles united. - - CACTACE.E. LXl. 

 16 Flowers very irregular, one-sided or two-sided.*. . . 17 

 16 Flower regular or nearly so. ... 19 



17 Filaments 6 8, united below into 2 sets. ... 18 



17 Filaments 5, united only at top. BALSAMINACEJE. XXVIH. 



17 Filaments 8, distinct. Leaves simple, peltate. - TROPJEOLACES. XXIX. 



17 Filaments 8, distinct. Lvs. biternute, with tendrils. SAPINDACEJE. XLIV. 



18 Leaves much dissected and divided. FUMARIACE.E. XII. 



18 Leaves simple, entire. POLYGALACEJE. XVI. 



19 Ovary superior free, from the calyx or nearly so. ... 20 



19 Ovary interior wholly adherent to the calyx. ... 30 



Sepals 2. Fleshy herbs. ---------- PORTULACACE^:. XXIV. 



2-. Sepals 3 or more. Herbs leafy, green. ... 21 



20 Sepals 3 or more. Herbs leafless and not green. ... 87 - - - (LXXVIII.) 



21 Stamens hypogynous situated on the receptacle. ... 22 



21 Stamens perigynous situated on the calyx or corolla. ... 28 

 22 Sepals, petals and stamens symmetrical. ... 23. 

 22 Sepals, petals and stamens unsymuietrical. Fruit a pod. ... 26 



