CRUCIFKK^. (mUSTAUD FAMILY.; 03 



or else incumbent, viz. the back of one cotyledon applied to the radicle, 

 thus c(D. In these cases the cotyledons are plane ; but they may be 

 Ibhicd upon themselves and round the radicle, as in Mustard, wliere they 

 arc conduj)licate, thus o v). In Leavenwortliia alone the whole embryo is 

 straight. — Leaves alternate, no stipules. Flowers in terminal racemes 

 or corymbs : jiediccls rarely bracted. — A large and very natural iiimily, 

 of pungent or acrid, but not poisonous plants. (Characters of genera 

 taken from the pods and seeds ; the ilowers being nearly alike in all.) 

 I. SlLlQl'Oy.E. Poll long, a A77i"(;ue, opening by valves. 



Tribe I. ARABIDEJE:. I'od elongated (except in Nasturtium). Seeds orbicular or 



oval, more or less flattened. Cotyledons accumbent, plane. 



* Seeds small and turgid, seldom half the breadth of the turgid pod. 



1. Nastnrtiiini. I'od terete, linear, oblong or even globular. Flowt-rs white or yellow. 



• * Seeds flat or flattish, scarcely narrower than the partition, e.xcept in some of No. 5. 



2. Leaveii^vortlila. Pod oblong, flat; the valves nervi-less. Seeds winged: embryo 



straight ! Flowers white or purplish, with a yellowish base. Leaves all nulical. 



3. Delitaria. I'od Hat, lanceolate ; the valves nerveless, opening elastically from the base. 



Seeds wingless, on broad seedstalks. Flowers white or purple. Stem naked IkjIow. 



4. Cardniniiic. I'od flat, linear or lanceolate; the valves nerveless, opening elastically. 



Seeds wingless, on slender stalks. Flowers white or purple. Stem leafy, at least below. 

 5 Arabis. Pod linear, elongated, flat or flattish, rarely almost terete ; the valves commonly 

 with a prominent midrib, or veiny, not opeiiiug elastically. Flowers white, whitish, or 

 purple. Stems leafy, at least below. 



6. Barbnrea. Pod linear, more or less 4-sided, the rigid valves being keeled by a promi. 



nent midrib. Seeds wingless. Flowers yellow. 

 Tribe II. SISYMBRIE.E. Pod elongated. Seeds thick ish, mostly obloug. Cotyle- 

 dons incumbent, narrow, plane. 



7. Krysiiiiiiin. Pod sharply 4-angled, linear. Flowers yellow. 



8. Sisyiiibriiini. Pods terete, 4- C-augled, or flattish. FlDwers white or yellow- 

 Tribe III. BIlASSICE.aE. Pod linear or oblong. Seeds globular. Cotyledons in- 

 cumbent and conduplicate, folded round the radicle. 



9. Bra!4slca (including Six.\pis). Pod beaked or pointed beyond the end of the valves, 



or tipped with a rigid style, nearly terete, or 4-sided. Flowers yellow or whitish. 



II. SILICULOS.E. Pod short, a silicic or pouch, opening by valves. 



Tribe IV. ALYSSINEi*:. Pod oval or oblong, flattened parallel to the broad parti- 



ticin, or globular. Cotyledons accumbent, plane 

 1. Nasturtium. Pod terete or globular with many small seeds. 

 ^M|^-iiba. Pod flat, oval, oblong, or even linear, many-seeded. 

 inHKyssuin. Pod flat, orbicular, '2-4-seeded. 



12. Vesicaria. Pod globular-inflated, 4 -several -seeded. 



Tribe V. CAMELINEi^. Pod turgid or somewhat flattened p.irallel with the broad 

 partition. Cotyledons incumbent, narrow. 



13. Cauifllnn. Pod pear-shaped, many-seeded ; style slender. Flowers yellow. 



14. .^ubulnria. Pod globular, few-seeded : style none. Flowers white. 



Tribe VI. I.EPIDINK.^ and TIlI.,ASPII>EiE. Pod short ; the boat-shaped 



valves cnniluplicate or much flattened ci>nlrary to the narrow partition. Flowers white. 

 l.i. ('n|t!irlla. Pod many-seeded, obenrdate-tri.angular, wingless. Cotyledons incumltent. 

 IC. Tlilaspi. Pod-sevtral-seeded, obovate or obcordate, winged. Cotyledons accumbenL 

 17. Lepldiiini. Pod 2-secded, flat, scale-shaped. Cotyledons incumbent or accumbent. 



15. Seael>lt-ra. Pod 2-8eeded, didymous ; the valves rugose, separating at maturity from 



the little partition as two closed one-seeded nutlets. Cotyledous incumbent, narrow. 



