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Project Name Data (Last Modified On 1/22/2013)
 

Flora Data (Last Modified On 1/22/2013)
Genus PILEA Lindl.
PlaceOfPublication Coll. Bot. pl. 4. 1821, nom. conserv.
Synonym Adicea Raf. Anal. Nat. 179. 1815, nom. rejic.
Description Annual or perennial, monoecious or dioecious herbs, sometimes suffrutescent, often succulent, without stinging hairs; stipules intra-axillary, deciduous or per- sistent; leaves opposite, usually petiolate, toothed or entire, those of a pair equal or markedly unequal, similar in shape or very dissimilar; flowers in unisexual or androgynous clusters, these solitary or forming cymes or panicles; staminate flowers 4 (rarely 2 or 3 ) -parted, the pistillate normally 3-parted, the middle segment usually larger than the lateral ones; stigma sessile, penicillate; achenes compressed, orbicular or ovate.
Habit herb
Key a. Leaves entire. b. Leaves orbicular to obovate, not more than 1 cm. long, 1-nerved or nerveless, succulent ........................................................ 1. P. MICROPHYLLA bb. Leaves ovate-lanceolate or elliptic, more than 1 cm. long, 3-nerved, membranous ......................................................... 2. P. PARIETARIA aa. Leaves (at least the larger of a pair) toothed. b. Leaves of a pair dissimilar or very unequal, the larger more than twice as long as the smaller. c. Inflorescence sessile or subsessile, few-flowered; smaller leaves subentire ......................................................... 3. P. IMPARIFOLIA cc. Inflorescence peduncled, often branched; smaller leaves toothed. d. Leaves all distinctly petiolate; stipules persistent. e. Smaller leaves broadly ovate or suborbicular; stem drying straw-colored; plant glabrous throughout ................................. 4. P. CORNMANAE ee. Smaller leaves oblong; stem drying dark; plant usually pubes- cent toward tip of stem and on under side of leaf nerves ......... 5. P. TRIANAEANA dd. Smaller leaves of a pair sessile or sub-sessile; stipules soon deciduous. e. Larger leaves oblanceolate, up to 2 cm. wide, their petioles not more than 5 mm. long; segments of staminate flowers with filif orm tips ............. ................................................................ 6. P. CHIRIQUINA ee. Larger leaves ovate or elliptic, 4-7 cm. wide, their petioles more than 5 mm. long; segments of staminate flowers not filiform-tipped ..................................................... 7. P. DONNELL-SMITHIANA bb. Leaves of a pair similar and equal, or if unequal the larger not more than twice as long as the smaller. c. Achenes 1-2 mm. long, strongly flattened. d. Leaves sessile or with a petiole much less than a third the length of the blade, often long-tapering at base ....................................... 8. P. PTERICLADA dd. Leaves distinctly petiolate, rounded or abruptly narrowed at base. e. Stipules not more than 1.5 mm. long, soon deciduous; plants glabrous throughout; tips of staminate perianth segments minute ...................................................... 9. P. GRACILIPES ee. Stipules well developed and persistent or subpersistent; plants, especially the leaves, usually pubescent; staminate segments with long, filiform tips. f. Stem densely pubescent; leaves ovate or ovate-lanceolate, generally more than 2 cm. long, rugose ................................... 10. P. RUGOSISSIMA ff. Stem glabrous; leaves rhombic-ovate, generally not more than 2 cm. long, flat .............. .................................... 11. P. AURICULATA cc. Achenes minute, scarcely more than 0.5 mm. long, only slightly flattened. d. Stem repent or trailing, with nearly equal internodes; leaves all orbicular ....................................................................................... 12. P. NUMMULARIFOLIA dd. Stem erect, repent only at base; at least the principal leaves ovate, obovate, rhombic, or elliptic. e. Inflorescence shorter than the petioles; plants essentially glabrous. f. Annual; leaves rhombic-ovate or ovate, thin, up to 4 cm. long; achenes stramineous, smooth. 13. P. HYALINA ff. Perennial; leaves elliptic-lanceolate, thick, 8-20 cm. long; achenes black, papillose ................................................ 14. P. PALLIDA ee. Inflorescence longer than the petioles; plants more or less pubescent. f. Leaves obovate, rounded at apex, the cystoliths on upper surface much more numerous toward the margin ................. 15. P. INVOLUCRATA ff. Leaves ovate, ovate-lanceolate, or elliptic-lanceolate, acute or acuminate, rarely subobtuse, the cystoliths more evenly covering the upper surface. g. Leaves ovate-lanceolate or elliptic-lanceolate, averaging more than 4 cm. long, sharply dentate; plants usually dioecious ................................................ 16. P. ACUMINATA gg. Leaves broadly ovate, averaging less than 4 cm. long, coarsely crenate-serrate; plants usually monoecious ......... 17. P. PUBESCENS
 
 
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