1G4 
Hermann Wolff. — Umbelliferae-Saniculoideae. 
Pazifisches Nordamerika: Von Nord-Idaho durch Washington und Oregon 
(Geyer n. 583) bis Central-Californien; blüht von Juli bis September. 
Nota. Habitum stirpis et modum evolutionis cl. Geyer apud II o oker 1. c. bis verbis descripsit: 
»In April the young plants are wholly submerged, and present the appearance of some articu- 
\a.icd Jimcus, the Icaves, or ratber the pctioles, being similarly terete andjointed. On emerging 
above tlie water these petioles expand into laminae at the top, retaining the jointed swollen 
cliaracter in the costa. Tlie radical petioles are 8 to 1 0 inches long. Those of the stem, in 
j)roportion as they are out of the water, become flattened and the margin spinuloso-ciliate.c — 
E. articulatum et species affines eodem modo crescunt ut species gerontogeae E. corniculatum 
et E. Barrelieri. 
55. E. petiolatum Hook. Fl. bor.-arner. I. (I 834j 259; Torr, et Gray, Fl. North 
Amer. I. (1 840) 604, ex pte. (?); Coult. et Rose, Revis. N. Amer. Umb. (1 888) 97 et 
in Contr. U. S. Nat. Herb. VII. 1. (1900) 53. — E. aquaticum Hook, et Arn. Bot. 
Beech. Voy. (l83'2) 142, sec. Ind. Kew. — E. petiolatum var. juneifolium Gray in 
Proc. Amer. Acad. VIII. (1 872) 385. — Gracile 30 — 50 cm altum. Gaulis inferne 
Simplex vel remotissime ramosus, apice 3 — 4-furcatus, ramis semel vel bis cymose 
divisis. Folia basalia pauca, erecta, vetustiora plerumque tantum fistulas satis amplas, 
compressiusculas, supra rb canaliculatas, superne anguste, ad basin versus sensim latius 
alatas, nodoso-septatas, ad nodos setis singulis vel 2 — 3-natis obsitas sistentia; f. serius 
exorta apice petioli talius vel similis laminam parvam, anguste lanceolatam, longiuscule 
acuminatam, subintegram vel =b profunde spinuloso-seiTatam, subparallelinerviam ferentia; 
caulina et fulcrantia illis similia, brevius petiolata, longius densiusque spinuloso-serrata, 
spinis saepe spinulis accessoriis auctis. Capitula satis parva semiglobosa, ad 8 mm 
diametro; bracteae involucrales angustissime lineari-subulatae, rigidae, inferne scarioso- 
dilatatae ibique paucisetosae, basi dorso spinis deflexis subnumerosis auctae, capitulis 
usque duplo longiores; florales anguste subulatae, flores longe superantes et cum br. 
invol. habitum capitulorum spinosum formantes. Sepala lanceolata, cuspidato-acuminata, 
stylis longiora; petala perparva, obovata, triente excisa, lobulo inflexo subaequilongo, 
2 — 3-plo angustiore, apice fimbriato. Fructus ubique squamis depressis lanceolatis, 
acuminatis, subaequalibus obsitus. 
Pazifisches Nordamerika: An grasigen, im Winter überschwemmten Stellen in 
West-Oregon (Hall, Fl. oreg. n. 200; Howell) und im Staate Washington 
(Suksdorf, Fl. Wash. n. 3 44); blüht im .luli und August. 
56. E. elongatum Coult. et Rose in Contr. U. S. Nat. Herb. VII. 1. (1 900) 53. — 
Planta 30 — 40 cm alta, superne ramosa, apice plurifurcata, ramis dr cymose ramulosis. 
Folia basalia elongato-oblanceolata, margine spinuloso-serrata, apice abrupte acuminata, 
inferne sensim in petiolum alatum spinulosum angustata et cum eo usque 30 cm longa; 
caulina similia, sed multo angustiora. Capitula breviter stricteque pedunculata, sub- 
globosa, ad 1 5 mm longa; bracteae involucrales lineares, vix rigidulae, demum reflexae 
et usque 25 mm longae, basi zb scarioso-marginatae, ceterum margine setoso-spinu- 
losae; florales rigidae, angustae, integerriinae, margine infero scariosae ibique plerumque 
inermes, floribus paullo longiores. Sepala ovata, abrupte mucronato-apiculata, 2 mm 
longa, stylis breviora. 
Pazifisches Nordamerika: Californien, in der Bai-Region (Vasey, nach 
Coulter und Rose). 
Nota. Spccimina mihi non visa. Stirps scc. descriptionem A'. peffolato Hook, valde afhnis 
esse videtur. 
57. E, Jepsonii [E. jepsoni) Coult. et Rose in Contr. U. S. Nat. Herb. VII. 1. 
(1 900) 54; .leps. Fl. West. Middle Calif. ed. 2. (1 91 1) 289. — E. californicum Jeps. 
1. c. ed. 1. (1 901) 343. — E. petiolatum Aut. amer. plur. non Hook. — Gaules plures 
graciles, 40 — 60 cm alti, mox supra basin ramosi, apice plurifurcati, ramis cymose 
divisis. Folia vetustiora fistulas septatas, apice breviter dilatatas sistentia, ca. usque 
50 cm longa, sub anth. plerumque jam emortua, f. serius exorta et caulina oblanceolata, 
haud raro remote et anguste pinnatifida, spinuloso-incisa, ad basin versus in petiolum 
