KEY TO SUB-CLASSES, ORDERS AND GENERA. 121 
THALAMIFLORAi—cont, 
(2) Stamens definite, 12 or fewer, or if indefinite (Ruraces, Citrus, 
Mle) then the leaves gland-dotted :— 
(A) Leaves pellucidly gland-dotted and aromatic, simple or compound, 
opposite or alternate ; calyx lobes and petals 4—5, latter often 
valvate ; stamens inserted outside prominent disk :— 
XXVI—Rvrace*. 
(B) Leaves not gland-dotted :— 
(a) Leaves opposite, simple ; calyx-lobes and petals 5 ; stamens 10 ; 
disk obscure ; ovary 3-celled, cells 1-ovuled :— 
XXIII—MALPIGHIACE®. 
(b) Leaves alternate ; if opposite (CeLasTRACE®, severnl species), 
the disk large, or (AQUIFOLIACE®, Curtisia), the flowers 4- 
merous :— 
(a) Carpels syncarpous septate, or apocarpous ; ovules few, pendu- 
lous, erect, or ascending :— 
(*) Stamens alternate with the petals :— 
(¥) Ovules and seeds pendulous :— 
(§) Leaves compound, often bitter; or if simple (SIMARUBACE4, 
Samadera, Suriana), then fruit of 1—5 apocarpous 
drupes, or (MELIAcEx, Turrea, Beddomea), then filaments 
united in a tube :— 
(|) Filaments free; fruit of 1--5 apocarpous samaras or 
drupes ; leaflets opposite :— we XX VII—SIMARUBACE®. 
Cif) Filaments united ina tube, if free (Walsura Cedrela, 
Chlorozylon), then fruit a tomentose berry or cap- 
sule :— Ar a see act we. XX X—MELIACES.- 
(§§) Leaves simple :— 
(||) Petals 2-lobed, imbricate; raphe of seed ventral :— 
XXXI—CHAILLATIACES, 
(\\\!) Petals entire ; raphe of seed dorsal: fruit a drupe :— 
t) Petals usually valvate ; fruit 1-celled, 1-seeded :— 
XXXIII-—IcactnacE”. 
(ff) Petals imbricate ; fruit of 3—5 one seeded pyrenes :— 
XXXIV—AQUIFOLIACE, 
(+t) Ovules and seeds erect or ascending :— 
(§) Ovary 8—5-locular ; leaves simple :— XXX V-—-CELASTRACEX. 
(§§) Ovary 1-locular with leaves simple cr compound, or 2--5 
locular with leaves compound :— --. XML—ANACARD) ACER. 
(*#*) Stamens opposite the petals :— 
(+) Leaves simple, exstipulate; ovary 1-celled, or-3—5-celled at 
base only ; calyx small or O ; petals valvate :—XXXII— Onacace#. 
(tt) Leaves simple or compound. stipules large caducous ; 
ovary 2--6-celled; calyx small, entire or 4—5-lobed ; petals 
valvate :— see oes ice ... XXXVII—AMPELIDACES. 
(ttt) Leaves simple or compound, exstipulate; ovary 2—3- 
celled; calyx 4—5 partite, imbricate; petals imbri- 
cate :— { ae aaa Jes wee =X XXIX—SABIACES. 
(8) Carpels syncarpous, l-locular, placenta 3-parietal with numerous 
ovules ; disk large lining the calyx tube; flowers irregular; 
calyx segments, petals, stamens, staminodes, each 5 latter 
5—7 ; leaves bi- or tri-pinnate with jointed pinnas and folioles :— 
XTI—MoRINGACE#. 
(11) Sepals valvate in bud; if imbricate, or subimbricate, then always with 
valvate petals, and either (ANONACE#, Polyalthia sometimes) with 3-merous 2- 
sexual flowers, or TILIAceE®, Elwocarpus sometimes) with anthers dehiscing 
transversely, or (BURSERACE, Bursera) with balsaminous sap :-— 
(i) Sepals free ; flowers 3-merous ; stamens free, indefinite; ripe carpels free, 
rarely (Anona) conjoined :— ae sce a eee eS .» ILV—ANONACEZ. 
(ii) Sepals united below; if free (T1L1acEm, Grewia, Triwmfetta), then 
flowers not 3-merous flowers 4—5-merous :— 
(1) Stamens monadelphous :— 
(A) Stamens indefinite (Eriodendron 5—7 only) in a column around the 
style with only short free filaments towards the apex, or dividing 
upwards into phalanges opposite the petals ; ultimate filaments 
