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Key to PinusView taxon page for Pinus
(For a list of species in Pinus, use the above link.) Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots. 1. Lf-bundle sheath  A surrounding or partially surrounding, often tubular structure or part of a structure, such as a leaf base in Apiaceae or Poaceae. deciduous or mostly so; seed cone scale  1. Wide, appressed, membranous, epidermal outgrowth (e.g., Cheilanthes covillei) 2. Structure partially or entirely covering an over-wintering bud (bud scale) (e.g., Salix goodingii bud). 3. In gymnosperms, a woody, seed-bearing structure attached to the cone axis (cone scale) (e.g., Abies magnifica). 4. In Asteraceae, a flat, membranous pappus element (e.g., Hymenoxys hoopesii). Leaves or bracts may be scale-like in one or more of the preceding ways. tip generally without prickle 2. Leaves generally < 5 per bundle 3' Leaves generally 1–2 per bundle 5. Seed cone generally closed, generally torn apart by animals, generally not on ground intact; seed wings persistent on scale ..... P. albicaulis 5' Seed cone opening and releasing seeds, not torn apart by animals, generally on ground intact (except for released seeds); seed wings persistent on scale or not 6. Seed cone scale thinnest at tip, without prickle 7' Seed cone stalk > 2 cm; seed wings wide, deciduous from scale 6' Seed cone scale thickest at tip, with prickle 1' Lf-bundle sheath persistent; seed cone scale tip with prickle, at least when immature (sometimes 0 at maturity) 12. Seed cone 5–9.7 cm; leaf  Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets). generally 5–15 cm ..... P. muricata 13' Seed cone opening, asymmetric or ± symmetric 11' Leaves 3 or 5 per bundle (2–5 in Pinus ponderosa) 16. Crown ± closed, generally wider than long, most open seed cones with combined length and width > 27 cm, width > length; light colored scale tips generally prominent; n ChI (Santa Rosa Island) ..... subsp. insularis 16' Crown ± open, generally longer than wide, most open seed cones with combined length and width < 27 cm, width <= length; light colored scale tips generally not prominent; s SCo (mostly Torrey Pines State Reserve) ..... subsp. torreyana 15' Leaves 3 per bundle (rarely 2 in Pinus ponderosa) 17. Proximal seed cone scale tips recurved  Gradually curved downward or backward. , elongated 1.5–7 cm 18. Seed cone ± yellow; seed < wing  1. Thin, flat extension or appendage of a surface or margin. 2. In many members of Fabaceae and in some other groups, each of two lateral petals. ; leaf rigid, not drooping ..... P. coulteri 17' Proximal seed cone scale tips rarely recurved, then elongated < 3 cm 19. Seed cones on stems many years 19' Seed cones deciduous except stalks, proximal scales persistent 21. Bark crevices with definite odor of vanilla/banana, especially on warm days; scales of open seed cone ± crowded, generally not darker abaxially than adaxially; leaf gray-blue-green, glaucous; bark outer scales with ± pink inner surfaces; vegetative buds  1. An incompletely developed, more or less embryonic shoot, usually covered with bud scales. 2. An unopened flower, often protected by sepals. not resinous; seed cone generally 13–25 cm, scales each with a generally incurved prickle, bracts with white fringing hairs ..... P. jeffreyi 21' Bark crevices generally lacking odor of vanilla/banana; scales of open seed cone well separated to very crowded, generally darker abaxially than adaxially; leaf gray-green, shiny deep green, or light green; bark outer scales with ± yellow inner surfaces; vegetative buds resinous; seed cone 7–15(18) cm, scales each with a straight or outcurved prickle, bracts with light brown fringing hairs ..... P. ponderosa 22. Mature bark light to medium yellow-brown; maturing closed cones green; open mature cones generally 8–18 cm, scales abaxially black ..... var. pacifica 22' Mature bark generally medium to dark red- or yellow-brown; maturing closed cones ± green to dark purple; open mature cones 6–12(15) cm, scales abaxially brown with black striations or black 23. Immature seed cones green-brown to dark purple; mature open cones ovate  Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf. to ± conic, 7–12(15) cm, scales abaxially generally black, occasionally brown with black striations; CaRH, n SNH, MP ..... var. ponderosa 23' Immature seed cones dark red-purple; mature open cones ovate or generally conic, generally 6–11 cm, scales abaxially generally brown with black striations, occasionally black; CaRH, n SNH, Wrn ..... var. washoensis
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Not divisible into identical or mirror-image halves.