APPENDIX 1339 



19b. POTERIUM L. 



Caulescent herbs resembling Sanguisorba in habit. Leaflets with toothed blades. 

 Tlowers monoecious or polygamous, in dense short peduncled spikes. Hypanthium 

 4-angled. Sepals 4, green. Petals wanting. Stamens, in the staminate flowers, 

 numerous: filaments elongated. Pistils 2: stigmas tufted. Achenes included. — 

 Differs from Sanguisorba and Poteridmm in the numerous stamens and two pistils. 



1. Poterium Sangmsdrba L. Plants 3-8 dm. tall, glabrous or nearly so: 



leaflets mostly 9-13; blades suborbicular or reniform, varying to ovate or obovate, 



serrate or crenate: spikes globose to ovoid: sepals ovate, 3-3.5 mm. long: achenes 



about 3 mm. long. 



In cultivated grounds and on roadsides, Maine and Ontario to Maryland and Arkansas. 

 Naturalized from Europe. Summer. 



Page 555, in fifth line under Crataegus dispar, read "petioles" for "pedicels." 

 Page 570, after Chrysobalaims Icaco, add: 



3. Chrysobalanus pellocdrpus Mey. A shrub or small tree. Leaf -blades oval, 

 ■obovate or orbicular, mostly 2-6 cm. long, typically rounded or abrviptly pointed at 

 the apex : sepals about 2 mm. long : petals spatulate : drupes obovoid or oblong- 

 • obovoid, 1..5-2 cm. long, purple, the stone sharp-ridged. — Differs from C. Icaco in the 

 spatulate petals and the obovoid or oblong-obovoid drupe with its sharp-ridged stone. 

 In low grounds, southern peninsular Florida. Also in the West Indies. All year. 



Page 573, after Prunus angustifolia, insert: 



14a. Prunus genicul^ta Harper. A diffusely branched shrub L5 m. tall, with 

 numerous zigzag somewhat spinescent branches. Leaf-blades oblong, 1-2.5 cm. long, 

 mucronate, finely crenate-serrate, rather short-petioled : flowers in lateral few- 

 flowered sessile umbels appearing before the leaves: pedicels stout, 2-3 mm. long: 

 •corolla white, 1 cm. wide or less: drupes oval or globose oval, 2.5 cm. long or less. — 

 Differs from P. angustifolia in the diffuse habit, the smaller flower-parts and the 

 short pedicels. 



On high sandy pine hills, Lake and Polk Counties, Florida. Early spring. 



Page 580, after Acuan depressa, insert: 



5a. Acuan virg^ta (L.) Medic. Stems mostly erect, glabrous or sj^aringly 

 pubescent: leaves with 2-6 pinnae; leaflets numerous, the blades oblong to linear- 

 'Obloug, 3-7 mm. long, not reticulated: pods narrowly linear, 6-9 em. long. — Differs 

 from A. depressa in the erect habit and the larger pods. 



In sand, Florida Keys. Also in the West Indies. All year. 



Page 591, after Poinciana pulcherrima, insert : 



9a. ERYTHROSTEMON Klotsch. 



Shrubs or trees, with unarmed branches. Leaves with many pinnae. Leaflets 

 numerous: blades rather broad, entire. Flowers in racemes or panicles. Calyx-lobes 

 much shorter than the petals, glandular-ciliate. Corolla conspicuous. Petals 5 : 

 blades of the petals broadened upward, that of the standard much smaller than those 

 •of the others. Pods unarmed, oblong or nearly so. — Differs from Poinciana in the 

 sessile or nearly sessile standard and the toothed sepals. 



1. Erythrostemon Gill^sii (Hook.) Klotsch. Shrub or small tree, the young 

 foliage glandular: leaflets very numerous; blades oblong or nearly so, 3-7 mm. long: 

 pedicels elongated: corolla yellow; petals, except the standard, cuneate to obovate- 

 •cuneate, 2.5-3 mm. long: filaments glabrous: pods 9-12 cm. long. 



In dry soil, Texas. Naturalized from South America. 



Page 591, after Guilandina major, add: 



3. Guilandina ovalifblia (Urban) Britton. A straggling shrub with cun-ed or 



hooked prickles, the foliage minutely pubescent. Leaves 1-2 dm. long or more, the 



leaflets numerous, the blades oval or suborbicular, varying to ovate or obovate, mostly 



1-2 cm. long, rounded or retuse and mucronate at the apex: racemes 1.5-2 dm. long: 



^bracts spreading: corolla light yellow, less than 1.5 cm. wide: pods obovate, 6-8 



