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A taxonomic revision of Podocarpus---IV. The American species of section Eupodocarpus, sub-sections C and D

1948; Arnold Arboretum of Harvard University; Volume: 29; Issue: 2 Linguagem: Inglês

10.5962/bhl.part.26198

2474-3283

J. T. Buchholz, Netta E. Gray,

Botany and Plant Ecology Studies

Accessory transfusion tissue absent.Sub-sect.D.Accessory transfusion tissue well-developed.Sub-sect.C.Leaves not pungent or spine-tipped.I. rave-relatively large, broad, flat, usually more than 6 cm.long.5 mm.wide; terminal bud scales lone acuminate, 3-4 or more times as long as wide.Upper surface of leaf flat or very slightly grooved with the groovebetween two ridges above midvein, becoming essentially flat toward the tip; hypoderm continuous above.Leaves with vascular sclereids; without accessory sclereids.Leaves linear -lanceolate, attenuate, elongate falcate, usualK 10-13 cm. or more long, 10-15 mm.wide.Upper epidermal cells 55-119 microns long.Female peduncles 7-10 mm.long; seed usually more than . corhiceus.Leave-lanceolate, rather -hurt angustate, acuminate, 10 cm.long, 5-15 mm.wide, the lower leaves petioled ; epidermal cells 24-66 microns long.Female peduncles 4-7 mm.long; Leaves 6-10 cm.long long (brazil) Leaves 6 cm.long, 5-0 mm.wide.Pollen cones 1-2 cm.,on K 2a.P. Sellowii var.august /folium Leaves with both vascular sclereids and accesson sclereids, linear lanceolate, attenuate, falcate, 8-14 cm.long, 8-15 mm.wide, flat above except for ridge at petiole and upwards.Female peduncles pear-shaped.10 12 mm.long or longer, ridged along back and crested (Venezuela) }. />, Pittieri.Hypoderm interrupted above.Male cones axillary, solitary though aggregated near tip ot branchlet.s,tdilorm, .v 3 s cm long, about 1 ram.wide.Seeds narrowly oblong ..void with a large blunt crest.Epidermal cells 15-40 microns wide (S.Chile) 20.P. soli gnus.ILpnderm continuous above.Leaves large.(. 15 cm long, epidermal cells 8-20 microns wide.Lower vascular and auxiliary sclereids both absent.Female peduncles 9-18 mm.long; seeds sub globose, more than 12 mm.long (Mexico i 4. /> Rdchei.Vascular sclereids and auxiliary sclereids both present.Female peduncles short, not over 7 mm.long; seeds less than 10 cm.long 5. P. Matudai.Female peduncles long, 9-18 mm.long; seeds very large, sometimes becoming flat toward tip, at most 5 cm.but usu less than 3 cm.lone, oblanreolate.Ihpoderm continuous abo vascular sclcreids present: auxiliary sclereids absent.Fen peduncles 5 mm.long, receptacle 6 mm.; seed 6 mm.Ions Brazil) 6. P. Rorain Leaves linear-lanceolate, 4 -8 cm.lonn, 6-11 mm.wide, with revolute margin; stiffly arched-spreading, recurved; vegetative bud scales ver\ large, becoming foliaccoiis (Venezuela) 7. P. Steyermarkii.Leave-ovate-lanceolate, oblong or obovate, thick and stiff, 5-12 cm.long, 12-17 mm.wide (on vigorous shoots and saplings up to 17 cm.long and 24 mm.wide) 8. P. magnifolius.Leaves less than 4 cm.long, lanceolate, somewhat channeled, 2-3.5 cm.long, 4-7 mm, wide.Vascular and auxiliary sclereids both present; epidermal cells 11-22 microns long.Female peduncles 3-4 mm.long; receptacle well developed, conically spreading, often 2 -seeded; seeds 7 mm.long (Bolivia) 9. P. Rusbyi.Bud scales ovate, acute, obtuse or apiculate but not attenuate.Bud scales apiculate.Leaves small, less than 2.5 cm.long, 4-6 mm.wide, divaricately spreading, with a distinct groove above midvein, lanceolate.Vascular sclereids and auxiliary sclereids both absent (SE.Venezuela) 10.P. tepuiensis.At least some ol the leaves on reproductive branches spine-tipped, with a ridge beneath midvein.Vegetaleaving transverse rhomboidal scars on stem (Jamaica) 11.P. Purdieanus.Leaves never spine-tipped, oval, flat above or with only an inconspicuous groove between low ridges above and having a shallow 1 mm.wide groove Leaves linear-lanceolate with a ridge above midvein; upper hypoderm interrupted.Vascular sclereids and auxiliary sclereids absent.Vegetative buds small with scales having relatively long apiculus (Guatemala, Brit.Honduras) 13.P. ; buds larger, bud scales obtuse, often cells 22-66 microns long (Brit.Hon-Epidermal cells :