736 
Ordo POMACEAE Juss, 
Pterostemon S. Schauer. 
Hypanthinm turbinatem, costatum, inferne germen in- 
nalum fovens, superius productum in limbum liberum conti- 
nue in calyeis foliola 5 sahnlata acuta abeuntem, Corollae 
petala 5, limbo hypanthii inserta, calycis phyllis alterna. 
Stämina 10, in margine disei vix conspieni paginam inter- 
nam limbi hypanthii vestientis inserfa, erecta, aequalia, pe- 
talis breviora; externa 5 so. sepalis opposita superne sub- 
petaloideo-alata, apice subtridentata dente medio antherilero; 
interne se. petalis opposita snbulata, anzunthera. Antherae 
dorso inserlae, introrsae, loculis distinetis in connectiro dor- 
sali mueronato oppositis, rima laterali hiante dehiscenti- 
bus ut anthera efloeia 4-alata appareat, Germen 5-Ioculare, 
loculis 4—5 -gemmulatis; gemmulae in angule centrali basi- 
fixae, ereciae, anatropae; siylus basi simplex, apice 5-Adus 
radiis (amen conglutinatis, quo stigma videlur integrum seb- 
capitatom 5-crenatum. Fructns ratione germinie vix mole 
auctus, fere sicens, dupliei perianthio androeceogue emarcidis 
coronatus, septis membranaeeis diruptis seine unico paueis- 
ve repleins. Semen erccium, testa cartilaginea; embryii eX- 
albuminosi radieula infera. — Genus perinsigne, nulli inter 
hucasgne cognita propius afline, staminum eyelo altero sle- 
rili, stylo quasi simpliei, fruciaque tandem mature cArDe 
fere destituto (nec tamen duro capsulari, sed herbaceo - molli) 
ordinem cum Myrtaceis iisque iuprimis ‚rerocarpieis prosi- 
me nectens, ceterom vero et habilum et characteres Poma- 
cearum manifesto prae se ferens. 
1. Pierostemon mexricanus 3. Schauer. — Grescit in MOR- 
tosig Mexici, ad Zimapan:. dschb, n. 259, b. 
Frotex ramosissimus, dichotome divaricatus, ramulis 
teretibas fenticellatis hirtello- pnbescentibus. Folia alterna, 
