Gymnospermae
SYNOPSIS OF GYMNOSPERMAE
- I. Class CONIFEROPSIDA.
- Trees and shrubs, usually evergreen, sometimes deciduous, usually monoecious, sometimes dioecious; lvs spirally arranged or opposite, scale-like, needle-like, linear, linear-lanceolate, sometimes lanceolate to elliptic or broadly ovate; ♂ strobili usually ± catkin-like, sometimes very short, small to large; pollen sacs 2-numerous; pollen winged or wingless, often with bladders; ♀ strobili forming a conelet, with few to many, spirally arranged or opposite scales, sometimes with distinct bracts as well on a very short to long axis; ovules few to many (2-9 per scale); fr. a cone, small to very large, usually woody or leathery, sometimes scales fleshy; seeds usually 1-2-(20) per scale, often winged, sometimes wingless:
- AraucariaceaeCupressaceaePinaceaeTaxodiaceae
- II. Class TAXOPSIDA
- Trees and shrubs, evergreen, dioecious or monoecious; lvs spirally arranged or occasionally opposite, usually needle-like, linear to lanceolate, oblanceolate or occasionally wider, sometimes scale-like; ♂ strobili short and ± catkin-like to globose, small; pollen sacs 2-8; pollen winged or wingless, often with bladders. ♀ strobili reduced and not cone-like; scales sterile, few and very reduced, on a very short receptacle stalk or axis; ovules 1-many with 1-(2) developing, seated on the receptacle; fr. ± fleshy, small, the single seed either surrounded by a fleshy aril or immersed in a fleshy receptacle or fleshy scales (epimatium), sometimes the outer seed coat fleshy instead; seed 1, wingless:
- Cephalotaxaceae (cultivated only) PodocarpaceaeTaxaceae
KEY TO FAMILIES OF CONIFEROPSIDA AND TAXOPSIDA
2
Lvs opposite or whorled, often all scale-like; plants always evergreen; cone scales opposite
Lvs usually alternate, very rarely opposite and then plant deciduous, sometimes fascicled, not all scale-like; cone scales alternate and spiralled
5
Anthers 4-9-locular; fr. with an erect seed, partly or wholly surrounded by a fleshy aril when ripe
Anthers 2-locular; fr. with an inverted seed, a true aril 0 or inconspicuous, the seed usually borne on a fleshy structure derived from the swollen receptacle and scales, or rarely fr. dry