194 DICOTYLEDONS. CONIFER.^. PhutS. 



10. P. compressmn, leaves linear very obtuse sessile, stem spikes 

 about 4-flowerec!. p. 58. — Ditclies. 



11. ¥. pusillujn, leaves linear opposite and alternate distinct 

 spreading from the base, stem cylindrical, p. .59. — DUclws. 



12. P, pectimUum, leaves distichous setaceous alternate slieath- 

 ing, stipules scarcely any, spike ot" flowers interrupted, p. 59. 

 — Rivers and sail waler ditches. 



Class III. DICOTYLEDONS. 



Emlryo with 2 or more colijledojis. Plumule in the centre of 

 their point of junction : the inferior end of the e.inhryo itself 

 elongated into a radicle, and not containing any secondary ra- 

 dicles in its substance. 



Ste7n increasing by external layers or additions ; with an evident 

 distinction between bark and wood. Leaves usually veined, 

 rarely nerved. 



Di V. I. PeriayiihyOrJloral covering, [fany, single {calyx of Juss.). 



Order I. CONIFER.E. Jms. 



Flowers usually amentaceous, with the anthers and pistils in di- 

 stinct flowers, mostly naked. Barren fi. 1 — many-celled, 

 sessile, on scale-like bracteit, or on the axis of the amentum. 

 Fertile Jl. Cupula 1-flowered, almost closed, shaped like a 

 pistil. Perianth adherent, membranous. Ovary 1. Sliguiu 

 sessile, simple. Nuts 1-cclled, 1 -seeded, either solitary or by 

 pairs within the unexpandcd cupiile, or covered by imbricated 

 enlarged bracteoe or peduncles forming a cone {strobilus) . Seed 

 pendulous, albuminous. Embryo with two or many cotyledons. 

 Radicle superior. 



Moncecious or diocciou.^ trees, generally abounding with rosin. 

 Leaves simple, acerose, opposite or vvhorled or fascicled. Mirb. 



1. PINUS. Decand. 



MoJicrcinut. Barren Jl. Amcnts (or Catkins) racemose, compact 

 and terminal, scaly, the scales bearing stamens at the extremity. 

 Siam.2. Anthe7-'s \-ce]\ed. Ferlilefl. ^/»e7//,9 simple, imbri- 

 cated, the scales acuminated. Ovaries 2. Stigmas glandulose. 

 Scales of the cones oblong, davate, woody at the apex, umbili- 

 cated and angular. Nats geminate, I -seeded, covered with an 

 appendiculated membrane. Co/?/ /erfo7?5digitato-partlte. Leaves 

 binous, or many from the same sheath. Decand. 



1. P. sylvestris, leaves in pairs rigid, cones conico-ovate acute as 

 long as tlie leaves generally in pairs, p. 'iJ^.— JJuods. 



