KEY TO THE FAMILIES AND GENERA 



101 



F. Fls. diurnal; floweritiK areoles 



with acicular spines, but no wool. 22. Carnegiea. 

 FF. Kla. nocturnal; wool or hairs usu- 

 ally produced in abundance with 

 the fls. 

 o. Ovary and fr. nearly smooth, 

 the few minute bracts with no 



hairs in their axils 23. Cepkalo- 



Go. Ovary and fr. covered with [cereus. 



bracts with long hairs in their 



axils 24. Oreocereus. 



DD. Flowering plants not different from the 

 sterile plants, 

 E. Plants tall erect trees. 



F. Fl., after withering, dropping frona 



the ovary 25. Cereus. 



FF. FI., after withering, persisting on 

 the ovary. 

 G. Fr. and fls. minute, often several 

 coming from each flowering 



areole 26. Myrtillo- 



QQ. Fr. and fls. medium-sized or {cactus, 



larger, only 1 coming from 

 each flowering areole. 

 H. Ovary and fr. covered wdth 



thin scales, but no fls 27. Escontria. 



HH. Ovarj' and fr. spiny but not 

 bearing large chartaceous 

 scales. 



I. The fr. edible, juicy 28. Lemaireo- 



[cereus. 



ir. The fr. dry 29. Pachycereus. 



EE. Plants low, often vines; or, if at first 

 elongated and erect, finally becom- 

 ing procumbent or clambering. 

 F. Fls. nocturnal. 



G. Fr. smooth, yellow 30. Ilarrisia. 



QQ. Fr. spiny, red. 



H. Sts. producing an abundance 



of aerial roots 31. Selenicereus, 



HH. Sts. not prodvicing an abund- 

 ance of aerial roots. 



I. Ribs usually 3 32. Acantho- 



[cereiis. 



11. Ribs 10 or more 33. Xyctocereus. 



FF. Fla. diurnal. 



G. The fls. irregular, narrow. 



H. Sts. slender, weak 34. Aporocactus, 



HH. Sts. stout, at first erect. 



I. Fr. spiny, with red pulp. . , .35. RcUkbunia. 

 n. Fr. not spiny, with white 



pulp 36. Cleistocactus. 



GO. The fls. regular. 



H. Fl.-tube much elongated; 

 spines on the ovary reduced 



to stiff bristles 37. Echinopsis. 



HH. Fl.-tube short, at least never 

 much elongated. 

 I. Plants producing a cluster 



of tubers 38. Wilcoxia. 



n. Plants without tubers. 



J. Usually stout but low, 

 sometimes procunibent: 



stigmas green 39. Echinoce- 



33. Viny; stigmas not green. [reus. 



K. Fls. small, yellow 40. Bergero- 



KK. Fls. large, red or [cactus. 



white 41. Heliocereus. 



Epiphyllanthus and Pterocactus are described. 



95. AI20ACEJE. 



A. Petals numerous: caps. 5- or more valved 1. Mesembry- 



[antkemurrit 



AA. Petals 0: drupe 3-8-3toned 2. Tetragonia. 



AAA. Petals 5-co ; caps. circumaci.ssile 3. Sesuvium. 



96. UMBELLIFER.ffi, 



Key condensed from Coulter & Rose's "Monograph of North 

 American Umbelliferse." Not arranged in sequence of relationship. 



A. Fls. in dense heads 1. Eryngium. 



AA. Fls. not in heads, evidently umbellate. 

 B. Fr. conspicuously bristly. 



c. The fr. covered with spines or hooked 



bristles 2. Sanicula. 



cc. The fr. with bristles only on the ribs 3. Daucus. 



BB. Fr. not bristly (except Osmorhiza and 

 Cuminum). 

 c. Oil-tube.-^ obsolete or obscure. 



D. The fr. strongly flattened laterally: Ivs. 



simple 4. Hydrocotyie, 



DD. The fr. not strongly flattened. 

 E. Seed-face concave. 

 F. Stylopodium conical. 



G. .\t base, fr. attenuate 5. Osmorhiza. 



GO. At base, fr. rounded. 



H. Ribs slender 6. Scandix. 



HH. Ribs broad, 3-angled, or al- 

 most wing-like 7. Myrrhis. 



pp. Stylopodium flat or wanting. 



o. Lvs. simple and perfoliate H. Bupleurum. 



GO. Lvs. large and decompound 9. Conium. 



EE. Seed-face plane 10. Mgopodium, 



CC. Oil-tubes distinct. 



D. Dorsally the fr. strongly flattened, with 

 lateral ribs more or less prominently 

 winged (see Musineon). 

 E. The oil-tubes solitary in the intervals 

 between the ribs, rarely 2. 

 F. Stylopodium conical. 



G. Slender and glabrous plants. ... 11. Oxypolis. 

 GG. Stout and pubescent, at least 



in the umbel 12. Heracleum, 



FF. Stylopodium flat or wanting. 



G. Plants caulescent and branching. 

 H. Color of fls. white. 



I. Lvs. pinnately dissected; 

 dorsal ribs filiform: plant 



slender 13. Anethum. 



n. Lvs. ternately or pinnately (See Dill.) 



decompound: dorsal ribs 

 prominent but slender: 



plant stout 14. Angelica. 



ui. Lvs. pinnately decom- 

 pound; dorsal ribs winged: 

 plant stout. 15. Selinum. 



HH. Color of fls. yellow 



1. Dorsal ribs prominent 16. Levisticum. 



II. Dorsal ribs filiform 17. Paslinaca. 



GG. Plants acaulcscent or nearly so. . 18. Lomatium. 

 EE. The oil-tubes more than 1 in the inter- 

 vals, usually several. 

 F. Plants caulescent or nearly so: 



fls. yellow or white 18. Lorruxtium. 



FF. Plants caulescent and branching. 



G. Fr. winged: fls. white 19. Archangel- 



GG. Fr. not winged: fls. yellow 20. Ferula, {tea. 



DD. Dorsally the fr. not strongly flattened, 

 usually more or less laterally flat- 

 tened. 

 E. The oil-tubes solitary in the inter- 

 vals between the ribs. 

 F. Stylopodium conical: Ifts. linear or 

 filiform. 

 G. Involucre wanting. 



H. Fls. white 21. Coriandrum. 



HH. Fls. yellow 22. Fmniculum. 



GG. Involucre present. 



H. Fls. rose-color: fr. bristly 23. Cuminum. 



HH. Fls. white: fr. smooth 24. CaruTn. 



FF. Stylopodium flat or wanting. 



G. Fls. white 25. Apium. 



GG. Fls. yellow. (See article Celery.) 



H. Ribs equal, broad and corky . . 26. Petroseli- 

 HH. Ribs winged or filiform. {num. 



I. The ribs conspicuously 



winged 27. Thaspium. 



II. The ribs filiform 28. Zizia. 



EE. The oil-tubes more than 1 in the 

 intervals. 



F. Stylopodium conical 29. Ligusticum. 



FF. Stylopodium flat or wanting. 



G. Seed-face sulcate or decidedly 

 concave. 

 H. Carpels flattened dorsally . . . .30. Musineon. 

 HH. Carpels strongly flattened 



laterally 31. Erigenia. 



GG. Seed-face plane or but slightly 



concave. 



H. Ribs all filiform:lfts. entire. ..32. Txnidia. 



HH. Ribs corky at least the lateral. 



I. Lvs. simple and i>erfoIiate: 



oil-tubes continuous 



about seed-cavity 8. Bupleurum. 



II. Lvs. pinnate, usually ser- 

 rate: oil-tubes 1-3 in the 

 intervals 33. Sium. 



The following genera are also treated: Aciphylla, Arracacia, 

 .\.Htrantia, Chaerophyllum, Crithmum, Dorema, Hacquetia, Meum, 

 .^Iolopo^permum, Peucedanum, Portenschlagia, and Seseli. 



97. ARALLACE.^. 



. Petals more or less imbricate, broadly affixed 



at base. 

 B. Lvs. pinnate. 



c. Lfts. entire or indistinctly crenate: ovary 



2-celled: glabrousevergreenahrubs 1. Delarbrea. 



cc. Lfts. serrate: ovary 2-5-celled: herbs or 



small deciduous trees 2. Aralia. 



BE. Lvs. digitate, whorled: fla. in simple ter- 

 minal umbels; styles 2-3, distinct in the 

 fertile fls. : herbs 3. Panax. 



