114 



CONTKinrTlONS FROM THK NATIONAL MKIIHAKIUM. 



jjafcd (.'> t(» 1:5 iin. I(»i\^); iippci'iiiost Iciivcs simple; uiiiIm'I !» to l"J 

 ruvt'd, with ])r()iiiiiinit iii\ oliirrc, iiiid iin'oluccls of lumicroiis scari- 

 oiis lancooliitc loiin-aciimiimtt' l>ra«'tl»'ts (! mm. ioni:': rays .") cm. lonyf; 

 p(>(lic('ls It! to :io mm. loiijic; t'niit liiicai-ohloiio-. s mm. loiiji', H mm. 

 hi'oad: oil tiih«'s lai'ifc. solitary in the liittTvals, 4 on the commissural 

 side; sulcus of seed face deeper than in (»ther species, and w ith more 

 ])i'oiMinent central I'id^'c. 



Type locality, "•wet ravines. Knijfhts Ferry. Stanislaus C'ounty," 

 California; collected l)v IiHf<hni\ May S. 1854; typ»' in llerh. (Jray. 



('entral C'alifoiiiia. 



>S/ii I'liiii Kx i:i(uiiiiii'(l: 



('ai.iI'OHm a: Mt'iiiloi'iiin ('niiiity, <!. IL Vnnni, in lS7r>; Santii l,Mi'i;i MniintaiiiH, 

 /.'. /,'. Viisiii •1-11 , ,Iuly, ISSd; thrni,. 



33. SIUM L. Sp. ri. 1: 'lh\. 17r.;5 



Calyx teeth minute. Fruit llattened latci'ully. ovate to ohlonjv, 

 plal)rous. ("arpel with pi'ominent c(trUy neai'ly (Mpial ribs, each with 

 a })rominent e-roup of sti-enythenine- cells at tij). .Stylopodium do- 

 pressed; styles shoi't. Oil tubes 1 to 

 :') in the intei'vals (nevtu' solitary in all 

 the intervals), -2. to ti on the commis- 

 sui'al side. Seed sul)anjifular. with 

 7 plani> face. 



Smooth pei'cnnialsoTowinjj;' in water 

 or wet i)laces. with pinnate leaves 

 and sei-rate or pmnatihd leallets, in- 

 volucre atid inv«)lucels of numerous narrow bracts, and white flowers. 

 First species cited, S/'m/i (((tit'nlliiin L. 



A j;(Mms of about lo species, belongine- to the north temperate 

 rejifions of both hemispheres, and also in South Africa. 



Stout and tall; IcallctM narrow; fiuit lar^'cr (.'! imii. loiiji) 1. S. virntdifnliiuii. 



Weak an<l iuwer; snliiiu'rgtMl or floatiiij^ leaves htoail; fruit .smaller (2 inin. long). 



'J. S. citrHonii. 



1. Slum cicutaefolium (Jnielin, Syst. 2; 4NiJ. iTiU. Fio. ;-^l. 



Siidii Vninu-r 'SVu-\\\. V\. Hor. Am. 1: ItiT. ISOIi. 



Stout, <■> t;; s dm. hioh; leatlt'ts ;5 to s pairs, linear to lanceolate, 

 sharply serrate and mostly acuminate. 5 to IH cm. long (lower leaves 

 sometimes submersed and linely dissected, as in the next); um])el 

 inany-i'ayed; rays 'l.U to 4 cm. long; pedicels 2 to <'> imu. long; fruit 

 3 mm. long, with prominent ribs; oil tubes ^ to tl od the commissural 

 side. 



Type locality luiknown to us. 



In swiunps from Newfoundland to Virginia, west to British Clohuii- 

 bia and northern California. We have no specimens from th(^ southern 

 belt of the I'liited States. 



I 



u 



M. 



