Genus i. 



POTATO FAMILY. 



'55 



dehiscent. Disk present, or none. Ovary entire, superior, 2-celled (rarely 3-5- 

 celled) ; ovules numerous on the axile placentae, anatropous or amphitropous ; 

 style slender, simple ; stigma terminal ; fruit a berry or capsule. Seeds numerous, 

 the testa sometimes roughened ; embryo terete, spiral, curved, or nearly straight ; 

 endosperm fleshy ; cotyledons semiterete. 



About 75 genera and 1750 species, widely distributed, most abundant in tropical regions. 

 * Fruit a pulpy berry; corolla plicate, its lobes generally induplicate. 

 Anthers unconnected, destitute of terminal pores, dehiscent. 

 Fruiting calyx bladdery-inflated. 



Fruiting calyx 5-angled and deeply 5-parted ; ovary 3-5-celled. 1. Physalodes. 



Fruiting calyx 5-lobed, not parted, 10-ribbed, often 5-10-angled, reticulated, wholly enclosing 

 the berry ; ovary 2-celled. 

 Corolla open-campanulate, yellowish or whitish, often with a dark center ; seeds with a 



thin margin, finely pitted. 2. Physalis. 



Corolla flat-rotate, violet or purple ; seeds thick, rugose-tuberculate. 3. Quincula. 

 Fruiting calyx somewhat enlarged, but closely fitted to the fruit, thin, obscurely veiny, open at 

 the mouth. 

 Corolla rotate, whitish ; lobes of fruiting calyx much exceeding the berry. 4. Leucophysalis. 

 Corolla rotate, whitish, sometimes tinged with purple ; fruiting calyx not exceeding the 

 berry. 5. 'Chamaesaracha. 



Anthers connivent or slightly connate ; fruiting calyx not enlarged. 



Anthers short or oblong, opening by a terminal pore or short slit in our species. 6. Solatium. 

 Anthers long, tapering from base to summit, longitudinally dehiscent. 7. Lycopersicon. 



** Fruit a nearly dry berry; corolla campanulate, little or not at all plicate, its lobes imbricated. 



8. Lycium. 

 *** Fruit a capsule; corolla funnelform. 

 Capsule circumscissile toward the top, which separates as a lid ; corolla irregular. 9. Hyoscyamus. 

 Capsule opening by valves. 



Capsule generally prickly. 10. Datura. 



Capsule not prickly. 



Flowers paniculate or racemose; stamens nearly uniform in length. n. Nicotiana. 



Flowers solitary; stamens very unequal. 12. Petunia. 



i. PHYSALODES Boehm. in Ludwig, Def. 41. 1760. 

 [Nicandra Adans. Fam. PI. 2: 219. 1763.] 

 An annual erect branching glabrous herb, with alternate petioled thin sinuate-dentate or 

 lobed leaves, and large light blue peduncled nodding flowers, solitary in the axils. Calyx 

 5-parted, 5-angled, much inflated in fruit, its segments ovate, connivent, cordate or sagittate 

 at the base, strongly reticulated. Corolla broadly campanulate, plicate in the bud, slightly 

 5-lobed. Stamens 5, included, inserted on the corolla near its base; filaments filiform, dilated 

 and pilose below ; anthers oblong, the sacs longitudinally dehiscent. Ovary 3-5-celled ; style 

 slender; stigma 3-5-lobed. Berry globose, nearly dry, enclosed in the calyx. [Greek, Physalis- 



like.] 



A monotypic Peruvian genus. 



1. Physalodes physalodes (L.) Brirton. 

 Apple-of-Peru. Fig. 3695. 



Atropa physalodes L. Sp. PI. 181. 1753. 

 Physalodes peruvianum Kuntze, Rev. Gen. PI. 452. 



1891. 

 P. physalodes Britton, Mem. Torr. Club 5 : 287. 1894. 



Stem angled, 2-$ high. Leaves ovate or 

 oblong, acuminate but blunt-pointed, narrowed at 

 the base. 3'-8' long, 1/-4' wide; petioles longer 

 than the peduncles; flowers l'-li' long and 

 broad; corolla-limb almost entire; fruiting calyx 

 l'-li' long and thick, its segments acute at the 

 apex, their basal auricles acute or cuspidate; berry 

 about I' in diameter, loosely surrounded by the 

 calyx. 



In waste places, escaped from gardens, Nova Sco- 

 tia to Ontario, Florida, Tennessee and Missouri. 

 Adventive from Peru. Plant with the aspect of a 

 large Physalis. Leaves similar to those of Stramo- 

 nium. July-Sept. 



2. PHYSALIS L. Sp. PI. 182. 1753.* 

 Annual or perennial herbs, sometimes a little woody below, with entire or sinuately 



toothed leaves. Peduncles slender, in ours solitary from the axils of the leaves. Calyx 

 campanulate, 5-toothed, in fruit enlarged and bladdery-inflated, membranous, S-angled, or 

 prominently 10-ribbed and reticulate, wholly inclosing the pulpy berry, its teeth mostly 



* Text contributed to our first edition by Dr. P. A. Rydberg, here somewhat revised. 



