Trihulns. ZVl.dl'II^ I.l..\( K.i;. 353 



* Herbs, with ii<> allmiiioii to the spcil, an aliiiDiid litf iiiihMo.aji"! ahrtipilt iiiiuioto UKMillr 

 opjjosite leaves. 



1. TRIBULUS. Scpal.s niul petals 5, rarely 4 «>r fi. Filamenln kIcikIit, uakol ; th<H«*< »«■ 

 fciif the petals sometimes adiiate to their haws ; the alteriialo om>» with a liy|Ki;;\ iioiii^ );bui<l 

 hehiinl caili. Ovary sessile ; cells iu* many or tw ire as many as ix-taU, I-S^m uli*<|. Fruit 

 lolieil, 5-U)(-12)-(<KC(His, i. e. splittiiij» at maturity iulo as many hard atid cVmiti uutlrU, 

 these usually muricato or spincscetit on the hack. 



* « Herbs with albumen to the »eed» and alternate leave*. 



2. PEGANUM. Sepals 4 or 5, foliaeeous. often cleft or jiinnatifid. ..jK-n in the bud. pemtrt- 

 ent. I'etals 4 or .'>, jii^htly convolute in the hud. Stamens 12 to !.'>, iniMTt<'<l ap>und a 

 low annular disk, one .series alternate with the petals, the others in j.airs Uffore them ; tUa- 

 ments naked; aiitiiers linear. Ovary 2-4-lol)e(l. a-4-<elleil ; numerous ovules in each oil 

 ujion a centr.ll jdacenta; style slender, at length twisted, alxtve acutely 3-4-anplcH| and 

 the angles stij^matosje. Capsule globose, coriaceous, tardily or im|>erfectly dohiiu-cnt, 

 many-seeded; seeds with spongy scrobiculate testa, and a slightly curvetl embryo in flenby 

 albumen. 



* # * Woody or suffrutescent plants, witli albumen to the seeds and opiH»«iu» leave*. 

 •*- Leaves 1-3-foliolate: subherbaceous or suffruticose. 



3. FAGONIA. Sepals 5. deciduous. Petals ."i. unguiculate, early deciduous. Stamens 10. 

 with tiliform naked filaments and short anthers. Ovary sessile. 5-oelled ; a pair of collateral 

 ovules in each cell. Fruit ovate. r>-lobed, subulate with the style. smiMith, 5 coccou.h ; the 

 carpels .lieparating from e.ich otiier and from tlie stylifen.us axis, ilehiscent ventrally. and 

 thin epicarp separalde from the cartilaginous endotarp ; .^eed solitary, with mucilaginou* 

 coat and horny allmmen. 



^_ ^_ Leaves abruptly pinnate; leatiets from one to several pairs: calyx deciduous. 



4. LARREA. Sepals and petals .V Stamens 10; filaments slender. I>earing on the inside 

 near the base a conspicuous 2-cleft or laciniate petaloid scale ; anthers oblong. ( »vary short- 

 stipitatc, globular, .'i celled, about 3 pairs of ovules in each cell; style filiform ; stigmas 5, 

 minute. Fruit villous. 5-lobed, 5-coccous; the carpels l-seeded. at maturity separating fn>ni 

 each other and from the slender axis, indehi.icent ; embryo slightly arcuate in the horny 

 alliunien ; its oblong cotyledons anterior and posterior in the carpel. 



5 GUAIACUM. Sepals and pet.ils .5 or sometimes 4. F'ilaments nake.l or Inaring a sm.ill 

 scale; anthers oblong, incurved in age. Ov.ary variously stijiit.ite. 2-5-angled. 2-5 celled, 

 and with 4 or .5 pairs of ovules in each cell ; style slendersubulate ; stigma small. Fruit 

 glabrous, 2-5-coccous. coriaceous or at first fleshy; the carpels 1- or sometimes 2we«ied, 

 separating at maturity, ventrally and sfmietimes dors.ally dehiscent ; seed with thick coat 

 and straight or somewhat curved emitryo in horny ali)umen ; oval cotyledons with edges or 

 sometimes their faces ventral and dorsal in the caqK-l. 



1. TRIBULUS, Ttmrn, C.vi.TUOrs. (Tpi'^oXo?, finritiit iiaiiu' of Tmpa, 

 transferred by the herltalists to this genus.) — Prostrate or ascemlinj; herb.s 

 mo.stly pubeseent, witli abruptly pinnate leaves, some or in certain sjH'cies all of 

 them becoming alternate by suppression of one of the pair, and yellow flowers on 

 simple peduncles. — Inst. 2G5, t. 1 11 ; L. Gen. no. 3r.O : Benth. & IIo<ik. (ien. 

 i. 264. Trihulus & Kalhtrcemia (Scop.), Endl. Gen. no. 6030, 6031 ; Gray. 

 Gen. 111. ii. 11'), 117. t. Ho, 146. 



§ 1. Cahx deciduous : cells of the ovary only as many as the petals, i. p. 5, 

 rarely 4, few-ovulate. forming as many nut-like spinescent or tuberculate 2-r>- 

 seeded cocci which at separation leave no central axis; the seeils sui>or|»oM'^l. 

 nearly horizontal and separated by transverse .M-pta. — Trihulus. Scop. Intnxl. 



253, &c. 



2.1 



