2 DICOTYLEDONEÆ. 
Bursereæ Bartl. Ord. nat., 393. — Amyridaceæ Lindl. Veg. 
Kingd., 459. 
Flores sepissime polygamo-dioici, rarius hermaphroditi, dialype- 
tali, rarius sympetali, actinomorphi, aut homostemonei staminibus 
petalis alternis, aut diplostemonei; staminibus basi vel margini tori 
insertis liberis; gynteceo 3-5-gyno, ovario 2-5-loculari libero; ovulis 
in loculis 2 collateralibus, rarissime solitariis, axi loculi supra me- 
dium affixis, sepissime pendulis raphe ventrali, micropyle supera. 
Fructus varius drupaceus indehiscens 2-5-pyrenus, pyrenis osseis 
abortu monospermis aut dehiscens epicarpio resinoso 2-5-valvatim 
secedente aut pseudo-capsulari seplicide dehiscente; embryone ple- 
rumque recto, raro hippocrepico, exalbuminoso, cotyledonibus sæpe 
membranaceis contortuplicatis, rarius crassis atque plano-convexis, 
radicula supera. — Frutices vel arbores, sæpe elatæ canalibus resini- 
feris instructæ, foliis alternis exstipulatis, trifoliolatis vel impari-pin- 
natis, rarissime simplicibus, floribus parvis. 
Flores diplochlamydei, bisexuales aut unisexuales, 3-5-meri, regu- 
lares. Calycis sepala 3-5 hypogyna plus minusve connata et interdum 
calycem cupuliformem efformantia, imbricata vel valvata. Petala basi 
vel margini tori inserta, 3-5, rarissime nulla (Ganophyllum), imbri- 
eata vel valvata, libera, erecta vel patentia aut rarius connata (Hed- 
wigia, Trattinickia). Stamina basi disci elevati vel rarius margini 
disci fundum calycis implentis inserta, tot quot petala vel duplo plura, 
tune æqualia vel alternatim inæqualia; filamenta subulata; antheræ 
dithecæ ovatæ vel oblongæ, versatiles, rima longitudinali introrsum 
dehiscentes. Discus annularis vel cupularis, plerumque liber, inter- 
dum calyeis tubum implens, raro inconspicuus. Gynæceum 2-5-carpi- 
diatum ; ovarium liberum, sessile, trigonum vel ovoideum vel globo- 
sum, 2-5-loculare ; ovula in loculis gemina collateralia, rarius solitaria, 
angulo centrali supra medium affixa vel ab apice loculi pendula, raphe 
centrali, micropyle supera. Stylus simplex brevis vel subnullus: 
stigma capitatum, 2-5-lobum. Fruetus drupaceus indehiscens aut 
epicarpio 2-5-valvatim secedente, 2-5-pyrenus pyrenis arcte cohæren- 
tibus aut ab axi centrali demum solutis, osseis, monospermis. Semina. 
oblonga vel oblongo-ovoidea, teretia vel angulata, rarissime com 
pressa, testa membranacea. Albumen nullum. Embryo rectus. sel 
rarissime hippocrepicus, cotyledonibus membranaceis contortuplícatis 
vel crassis plano-convexis, radicula supera. 
Frutices atque arbores, sæpe elatæ, semper canalibus intercellula- 
