4^ CRUCll-'EK.K. Hantbit.u. 



26. SENEBIEllA, DC 



Pod didymous, 2-ccllcd ; cells iudchiscuul, biihglobDsc;, separatmg at maturity from 

 tho puraisteiit linour axis, iiorvuicss, strongly nigoso or tubiirculalu, l-scedcd. yw'd 

 turgid, not winged ; cotylodoiis iiioumbciit. — Did'use or proatratn anmiuis or liiuii- 

 nials, witii miuuto wliito llowurs in racemes opposite to the pimiatiiid leaves. Sta- 

 mens often only two. 



Hidf a dozen species, mitives of tlie waiiuer and temperate regions of both lieniispheies. 

 1. S. didyma, Pers. Somewhat hirsute : stems diffusely branched, | to li feet 

 long : leaves pelioled, witli small narrow segments : pods small, emarginate above 

 and below, strongly reticulated, a line broad or more. — S. 2>i'i/i((lijhh(, DC ; (Jray, 

 Gen. 111. i. IGG, t. 72. 



San Pablo Landing {Bolander) ; introduced and jnoliably confined to sandy louidities near tlie 

 Bay of San Francisco. Widely distributed in warm regions around the globe. 



27. BISCUTELLA, Linn. 

 Pod llattened laterally, '2 -celled ; cells nearly orbicular, indehiscent, with a thick- 

 ened margin, separating at maturity from the persistent linear axis, 1 -seeded. Seeds 

 Hat, Itorizontal, not winged; cotyledons accumbent. — Erect annual or biennial, his- 

 pid or tomentoso branching herbs ; Avith entire or pinnatiiid leaves, and yellow or 

 purplish ilowers. 



A genus of 3 or more .si)eci('s, behmging to tlio l\[(!diten'anean region, to which Bentham and 

 Hooker have added the two folUiwing, previously kept distinct under the name ])ilhi/rwa. They 

 form a section dili'cring from the Old World species in the nearly sessile and conical or 2-lobed 

 broad stigma, tho simplo racenuis, whitish or j)nrplish Ilowers, stellate tomentum, and more leafy 

 stems. 



1. B. Californica, Jii'iith. <^ Hook. Tomentose with stellate hairs, annual : 

 stems G to 10 inches high, erect or ascending: radical leaves spatulate, .siuuately 

 toothed or pinnatiiid ; the ujipcr cuneate-oblong, sessile : sepals tomentose, linear, 2 

 to 3 lines long; petals (purple '() linear-spatulate, half an inch long: racemes loose 

 and elongated in fruit : pods 4 or 5 lines wide and half as long, emarginate above 

 and below, pubescent especially on the margin, with a small (!avity adjoining the 

 axis : style short : stigma dilated and depressed : pedicels horizontal, a line long. — 

 Gen. Plant, i. 91. JJithi/rcnu Caiifornica, Harv. in J.ond. Jour. Jiot. iv. 77, t. 5. 



On sand-hills near the Colorado River ; rare. B. Wislizkm, Engelm., is found faither to the 

 east, from Arizona to Texas. It is a loot or two high, more hafy ; pods luiger, broadly truncate 

 above, deeply cordate at base ; stigma conical ; pedicels 5 to 8 lines long. 



28. THYSANOCARPUS, Hook. 

 Pod 1-celled, indehiscent, plano-convex and much compressed, orbicular, winged 

 or margined, 1-seeded: seed pendulous, somewhat flattened, not winged. — Erect 

 and slender sparingly branched sjning annuals; with minute white or m.st-coloretl 

 Ilowers, the fruit nmstly iiondidniis on Hlender jKnlicels in ('longat(;d racenn's. 



1. T. CUl'VipeS, lloiii;. SdHicwhal hirsute at bnso, glalirou.s abov(', \ lo 2 feet 

 high: radical leaves oblanceolate, 1 to ;5 inches long, pinnatiiid or siiuiately toothed; 

 the upper linear or narrowly lanceolate, acununate, clasping by a broad auricled 

 base, entire or sparingly toothed : pods round to obovate or ovate, densely tomentose 

 or glabrous, 2 to 4 lines in diameter including the entire or crenate veined and 

 often perforated wing, emarginate at the summit and tipped by the short |)urple 

 style : pedicels 2 to 4 lines long. — Fl. i. G9, t. 18. T. pulchdlus & elegans, Fischer 

 &' Meyer; Hook. Ic. PI. t. 39. 



