UMBliLLIKER/E. (rARSI.F.Y FAMILY.) 1B9 



20. CIciita. Flowers white. Fruil subglobo3e, twin: the carpels Btrongly and equally 5- 



ribbeil. Lsaves twice or tlirice teriiate. 



21. Slum. Flowers white. Fruit ovate or globular : the carpels S-ribbeJ. Leaves all simplj 



l)liiiiate. 

 22 Cryptotieiiia. Flowers white. Fruit oblong. leaves 3- parted. Umbel irregular. 



II. Inner face of the seed hollowed out lengthwise, or the margins invo- 

 lute, .<;o that the cross-section is semilunar. (Umbels compound.) 



23. CIiK^rophy Hum. Fruit linear or oblong, narrowed or beaked at the apex. 



21. Ortiiiorrliiza. Fruit linear-club-shaped, tapering below : ribs bristly. 



25. Con I urn. Fruit ovate, flattened at tlie sides : ribs prominent, wavy. 



20. Kulophiis. Fruit ovoid, somewhat twin, ueaiffy destitute of ribs. 



III. Inner face of the seed hollowed in the middle, or curved inwards at 

 the top and bottom, so that the section lengthwise is semilunar. 



27. Erigenia. Fruit twin : carpels nearly kidney-form. UmbelleU few-flowered. 



1. HYDROCOTYLE, Tourn. Water rENNYwoRX. 



Caly.x-tcctli obsolete. Fruit flattened laterally, orbicular or shiekl-shapcd ; 

 the carpels 5-ribbed, two of the ribs enlarged and often forming a thickened 

 margin : oil-tubes none. — Low, mostly smooth, marsh or aquatic perennials, 

 witii slender crcci)ing stems, and round shield-shaped or kidney-form leaves, 

 with scale-like stipules. Flowers snuill, white, in simple umbels or clusters, 

 which are cither single or proliferous, appearing all summer. (Name from 

 v8iop, water, and kotvKt], a Jlal cup, the peltate leaves of several species being 

 somewhat cup-shaped.) 



* Peduncles much shorter than the petioles: pedicels short or none : leaves not peltate. 



1. H. repanda, Pers. retioies (2'-9' long) and peduncles (l'-2'long) 

 clustered on the creeping stems or runners ; leaves ovatc-heart-shipcd with a shal- 

 low open sinus, repand-tooth'd, thickish; flowers 2-4 in a head or cluster, with 

 a cons])icuons 2-leaved involucre; ripe fruit ribbed, reticulated between the 

 ribs. — Maryland ( IF. M. Canby) and southward. — Probably a variety of 

 II. Asiatica," L. 



2. H. ranunculoides, L. Petioles (2' -9' long) and peduncles (i'-l' 

 long, in fruit reflcxed) from long commonly floating creeping stems; leaves or- 

 bicular or kidneij-form, 3-7-cleft, the lobes broad and crenate; flowers 5- 10 in a 

 capitate luubtd ; fruit smooth, scarcely ribbed. — Pennsylvania to Virginia, and 

 southward. 



3. H. Americana, L. " Stents jUlfonn, branching, sprc:uling and cree])inLr ; 

 leaves rounded Lidiiei/-/orm, crenate-lohed and the lobes crenate, thin, verv smooth and 

 shining, short-petioled ; the f.;w-tlowered umbels of minute flowers in their a.xils 

 almost sessile. — Shady damp places : common northward. 



• # Peduncles scajw-lilce, as long as the slender petioles, all from slender runners or 



rootstoi'/cs creepimj in tlir mud: leaves orbicular, centrallij jultate, simply or doubly 

 crenate: fruit shifrp-margined. 



4. H. umbell^ta, L. Undwl many-flowered and simple or sometimes 

 proliferous (2 or 3, above one another); pedicels slender l^"-3" long); fruit 



