168 
the fruit. Rhus vernix, a Japanese tree, exudes a whitish resinous juice, which 
soon becomes black in the air. R. succedaneum and verniciferum have a si- 
milar property. Royle. 
GENERA. 
§ 1. AnacardiejE,DC. 
Anacardium, Rottb. 
Cassuvium, Lam . 
Acajuba, Gaertn. 
Rhinocarpus, Berter. 
Semecarpus, L. 
Anacardium, Lam. 
Holigarna, Roxb. 
Mangifera, L. 
Buchanania, Roxb. 
Melanorrhaea, Wall. 
Augia, Lour. 
Stagmaria, Jack. 
Gluta, L. 
Syndesmis, Wall. 
Dupuisia, Guill. 
Cambessedea, Kunth. 
Pistacia, L. 
Terehinthus, Juss. 
Astronium, Jacq. 
Comocladia, P. Br. 
Cyrtocarpa, H, B, K. 
Picramnia, Sw. 
Pegia, Colebr. 
Solenocarpus, W. et A. 
Coniogeton, Bl. 
§ 2. SUMACHINEiE,DC. 
Rhus, L. 
Toxicodendron, 
Tourn. 
Pocophorum, Neck. 
Schmalzia, Desv. 
Lobadium, Rafin. 
Phlebochiton, Wall. 
Odina, Roxb. 
Mauria, H. B. K. 
Duvaua, Kunth. 
Schinus, L. 
Lithrea, H. et A. 
Heudelotia, Guill. 
Dyctioloma, DC. 
Tricera, Lour. 
Trattinickia, W. 
Huertea, R. et P. 
Asaphes, DC. 
Boscia, Thunb. 
Rumphia, L. 
Thysanus, Lour. 
Barbylus, P. Browne. 
Barola, Adans. 
Lunanea, DC. 
Edwards^ia, Raf. 
Sub-Class II. INCOMPLETE. 
Essential Character. — Corolla absent in all cases; Ca/i/a? sometimes complete, and 
consisting either of several distinct sepals or of several combined into a tube; very often 
incompletely formed ; also often altogether absent. 
If we look merely at the paper characters of this and the first sub-class, 
we shall consider them very clearly distinguished from each other ; if we turn 
to the detail of anomalies in the Polypetalous sub-class, we shall be surprized 
to find how many instances there are where plants belonging to polypetalous 
orders, having no petals, would be referable to the Incomplete sub-class. I 
know of no way of getting over this difficulty, except by practice, by 
remembering, in the first place, that Polypetalous orders have seldom 
an imperfect calyx, and by endeavouring to identify apetalous Polypetalae 
with some of the orders of Incompletse, and when it is found that this 
cannot be accomplished, turning to the Polypetalous division, and acting 
with the plant in question as if it had petals. No truly polypeta- 
lous order can possibly, if common care be applied to the investigation, 
be confounded with any apetalous order, even if the petals are not taken 
into account. For example, Euphorbiacese, which are so often apetalous, 
have nothing like a station in Incompletse ; let us try this. They cannot 
belong to Rectembryosse, because their calyx is always perfect if present; 
Euphorbia itself would technically belong to Achlamydosse, and its flowers 
being in an involucre it might seem to belong to Monimiales ; it could not, 
how^ever, be one of Atherospermacese, because its anthers do not burst by re- 
curved valves : is it, then, a genus of Monimiacese ? certainly not, for its ovary 
is 3-celled and not 1 -celled; as it cannot be possibly referred to any other 
part of the Incomplete sub-class, it must then of necessity be some apetalous 
form of Polypetalse, and this ascertained, its true station will be easily found. 
And so of other cases. The fact is, that in Polypetalous orders there is a 
manifest tendency (nixus) to produce petals ; in the Incomplete sub-class there 
is no such tendency, but on the contrary, the force of developement is often so 
weak as to be scarcely able to complete even the calyx itself. 
It may be asked then, would it not be better to combine Incompletae and 
Polypetalse ? Upon paper it looks as if it would ; in nature it is otherwise : a 
