Fourth Contribution to the Flora of Australia. 199 
7 mm longae et fere totidem latae apice propter processus alares conni- 
ventes quasi obtuse rostratae ad !/,—!/, longitudinis septi emarginatae 
sed emarginatura vix vel paulum aperta; lobi alares obtusi; valvulae a 
basi alatae carina papillosae; stylus filiformis sursum curvatus brevis- 
simus emarginatura saepe triplo brevior; semina fusca ovata curvata ala 
angusta sed conspicua scariosa marginata circa 2!/, mm longa; embryo 
notorrhizus. 
Central Australia: Horn Valley, coll. R. Tate 1894 as L. rotundum 
(Horn Exploring Expedition). 
A very distinct new species, which may be essily distinguished from 
L. rotundum by its elongated racemes, very narrow petals and winged 
seeds; all the other Lepidium-species which come into consideration may 
be separated by their exceedingly short styles. 
27. Lepidium praetervisum Domin, nov. spec. 
Annuum, radice perpendiculari pauciramosa elongata tenui caules 
complures fasciculato-caespitosos debiles saepe elongatos gerente. Caules 
distantim ramosi, rami elongati subdivaricati tenues fere cylindrici pilis 
brevissimis minutis asperuli. Folia radicalia nunc emortua nunc prae- 
sentia et tune late obovata antice lobato-dentata basi cuneata 10—15 mm 
longa in petiolum (spurium) iis usque quadruplo longiorem angustata 
tenuia glabra vel subglabra; folia caulina valde distantia parva anguste 
cuneata vel anguste obovato-lanceolata basi angustata inserta circa 1 cm 
longa sed saepe breviora raro longitudinem 2 cm attingentia antice 
circa 3—6 dentata (dentibus triangularibus patentibus usque 4 mm latis 
saepe angustioribus) tenuia glabra sed ad margines plus minusve pilis 
minutissimis triangularibus (latitudine haud longioribus) paucis instructa. 
Racemi sub flore breves vel brevissimi sub fructu mediocriter (usque 
18 em) longi graciles debilesque laxissimi. Flores inconspicui minu- 
tissimi, Pedicelli pertenues floribus triplo et ultra longiores sub flore 
suberecti sub fructu in angulo circa 45— 50? patentes 4—4?/, mm longi. 
Sepala obtusa ovato-oblonga !/, vel vix !/ mm longa. Petala nulla. 
Stamina 2, antheris suborbicularibus. Siliculae parvae circa 2—2'/, mm 
longae pedicellis fere duplo breviores late rhombeo-oblongae vel ovato- 
rhombeae circa 1!/j—1?/, mm latae apice obtusae brevissime emarginatae; 
ala angustissima et tantum imo apice lobos duos minutos efformans; 
stylus brevissimus emarginatura brevior vel eam adaequans; septum an- 
guste ellipticum utrinque subacuminatum; valvulae laeves; semina fusca 
anguste ovoidea 1!/, mm longa; embryo notorrhizus. 
Bass Straits: Kents Group, Rob. Brown (Iter Australiense 1802 
usque 1805, no. 5266). 
Species inter congeneras distincta, foliorum forma Lepidium foliosum 
revocans, sed florum structura diversissima.  Lepidio Merralli proximum 
esse videtur, sed hoc secundum descriptionem authenticam caulibus pu- 
milis, foliis linearibus integris vel in lobos paucos angustos produetis, 
valvulis reticulato-venosis discrepat, caeterum notis plurimis speciem 
nostram optime quadrat. Ab omnibus reliquis gregis „Pseudoruderalia“ 
