RUBIACE^E 799 



coated at first with pale pubescence, and at maturity dark green and puberulous 

 above, paler and puberulous below, especially along the stout midribs and primary 

 veins, deciduous; stipules interpetiolar, conspicuously glandular-punctate at the base 

 on the inner face, inclosing the leaf in the bud, triangular, subulate, pink, becoming 

 oblong, acute, scarious, light brown, caducous. Flowers in pedunculate terminal 

 and axillary pubescent trichotpmous few-flowered cymes, with linear-lanceolate 

 acute bracts and bractlets at first pink, becoming scarious, deciduous, or sometimes 

 enlarging and rose-colored; flower-buds sulcate, coated with thick pale tomentum; 

 calyx-tube clavate, bracteolate at the base, covered with hoary tomentum, not closed 

 in the bud, the limb o-lobed, with subulate-lanceolate lobes green tinged with pink, 

 scarious, or in the central flower of the ultimate division of the cyme with 1 or 

 rarely with 2 of the lobes produced into oval or ovate acute rose-colored puberulous 

 raembranaceous leaf-like bodies, deciduous; corolla salver-form, light yellow, cinereo- 

 tomentose, with a long narrow tube somewhat enlarged in the throat, 5-lobed, the 

 lobes valvate in the bud, oblong, obtuse, marked by red lines and pilose, with long 

 white hairs on the inner surface, recurved after anthesis; stamens exserted; filaments 

 filiform, free; anthers oblong, emarginate; ovary 2-celled; style filiform, exserted, 

 slightly enlarged, 2-lobed and stigmatic at the apex; ovules numerous, inserted in 2 

 ranks on a thin 2-lipped placenta longitudinally adnate to the inner face of the cell. 

 Fruit a subglobose obscurely 2-lobed 2-celled capsule, loculicidally 2-valved, the 

 valves thin and papery, light brown, puberulous, especially at the base, faintly rayed, 

 marked by oblong pale spots and by the scars left by the falling of the deciduous 

 calyx limb and style, sometimes tardily septicidally 2-parted to the middle, persistent 

 on the branches during the winter, the valves finally falling from the woody axis, 

 their outer layer very thin, brittle, separable from the slightly thicker tough woody 

 inner layer. Seeds horizontal, 2-ranked, minute, compressed; seed-coat thin, light 

 brown, reticulate-veined, produced into a broad thin oblong-ovate wing, unsymmet- 

 rical on the sides, acute at the apex, and larger above than below the seeds; embrvo 

 elongated, immersed in the thick fleshy albumen; cotyledons ovate-oblong, foliaceous, 

 larger than the terete radicle turned toward the hilum. 



The genus is represented by a single species of the southern United States. 

 The generic name is in honor of Charles Cotesworth Pinckney (1746-1825) of 

 South Carolina, the Revolutionary patriot. 



1. Pinckneya pubens, Michx. Georgia Bark. 



Leaves unfolding in March, 5'-8' long, 3' 4' wide, their petioles f'-l-jj' in length. 

 Flowers 1^' long appearing late in May and early in June, in open clusters 7'-8' 

 across, their petaloid calyx-lobes sometimes 2^' long and ^' wide. Fruit ripening in 

 the autumn 1' long and |-' wide; seeds with their wings about ^' long and J' wide. 



A tree, 20-30 high, with a trunk occasionally 8'-10' in diameter, slender spread- 

 ing branches forming usually a narrow round-topped head, and branchlets coated 

 when they first appear with hoary tomentum, soon turning light red-brown, pubes- 

 cent during the summer, and slightly puberulous during their first winter, ultimately 

 becoming glabrous. Winter-buds: terminal ovate, terete, \' long, contracted above 

 the middle into slender points, and covered with the dark red-brown lanceolate-acute 

 stipules of the last pair of leaves of the previous year, often persistent at the base of 

 the growing shoots and marked at the base by 2 broadly ovate pale scar-like slightly 

 pilose elevations; axillary obtuse, minute or nearly immersed in the bark. Bark of 

 the trunk about \' thick, with a light brown surface divided into minute appressed 



