28 PLANTS WKIGHTIAN^. T. 



ZYGOPHYLLACE^. 



75. Kallstrcemia grandiflora (Ton: in herb. Hook.): suberecta, setis patenti- 

 bus hispida ; foliis 3 - 5-jugis ; pedunculis folio longioribus ; petalis (aureis) sepala 

 lanceolata longe acuminata duplo excedentibus ; staminibus 10 conformibus subse- 

 qualibus ; carpellis dorso rugoso-tuberculatis stylo persistente dimidio brevioribus. 

 — Borders of the Giia, Col. Emory. Sonora Alta, Mexico, Coulter, No. 783. 



Var. detonsa : multo minus hispida vel nuda, foliis minoribus. — New Mexico 

 (near El Paso "?}, Sept. — Stems a span to a foot high, from an annual root. Leaf- 

 lets oblong, slightly falcate. Petals an inch long. Style much longer than in 

 K. maxima. 



76. Larrea Mexicana, Moricand. PI. Nouv. Amer. t. 48 ; Torr. in Emory, Rep. p. 

 137. t. 3; Gray, Gen. III. 2. p. 120. t. 147. L. glutinosa, Engelm. App. Wisliz. 

 Mem. N. Mex. p. 93. Zygophyllum tridentatum, DC. ! Ic. Fl. Mex. From the 

 Eio Grande in Texas to New Mexico. Shrub 3 or 4 feet, in Northern Mexico from 

 5 to 8 feet high. — In Dr. Gregg's earlier North Mexican collection I find scanty 

 specimens of a curious new genus of this order, the characters of which are here 

 subjoined,* 



77. Vide p. 24 (Byttneriacese). 



78. Porliera angustifolia : ramulis foliisque glaberrimis ; foliolis 8-16 reti- 

 culatis ; stipulis espinosis ; floribus ssepius 5-meris 10-andris ; filamentis breviter 

 squamulosis ; stylo subulato apice bidentato ; ovario biloculari ; capsula obcordato- 

 biloba. — Guaiacum angustifolium, Engelm. in Wisliz. Mem. N. Mex. p. 113 ; Gray, 

 Gen. III. 2. p. 121. t. 149, Sf PI. Lindh. 2. p. 158 (subgen. Guaiacidium). On the 

 San Pedro River, Aug. — In the Genera Illustrata above cited, I did not refer this 

 plant to Porliera, with which it accords well in habit and in the squamulate fila- 

 ments (and sometimes even in having tetramerous fiowers), chiefly because that 

 genus is figured by Adr. de Jussieu as having a strongly arcuate embryo, with the 

 cotyledons parallel to the axis of the fruit. And indeed so I find the not yet fully- 

 grown embryo in a specimen of Porliera hygrometrica of Pavon's herbarium (now 



* SEKICODES, Nov. Gen. 



Calyx 5-partitus, persistens ; laciniis ovato-lanceolatis. Petala 5, rhombeo-ovata, subacuta, vix unguicu- 

 lata, subperigyna, nempe imo calyci inserta, laciniis ejusdem sequilonga, tarde decidua. Stamina 10, 

 sequalia, cum petalis inserta : filamenta filiformia, 5 petalis opposita nuda, 5 sepalis opposita basi intus 

 squamula bifida pilosa persistente appendiculata: antherse oblongo-lineares, introrsse, medio affixse. Dis- 

 cus nuUus. Ovarium sericeo-villosissimum, arete sessile, 5-loculare, 5-lobum, loculis sepalis oppositis : 

 stylus superne 5-angulatis, clavatis, angulis deorsum longiuscule stigmatosis. Ovula in loculis solitaria, 

 pendula. Fructus 5-coccus, siccus ; coccis sericeo-villosissimis, coriaceis, indehiscentibus, ab axi centrali 

 gracili secedentibus. Semen exalbuminosum, loculi conforme, apice ultra hilum rostellatum. Embryo 

 rectum : cotyledones ovales, axi contrariee : radicula conica supera. — Frutex humilis ramosissimus ; fo- 

 liis simplicibus ! parvis oblongo-spathulatis integerrimis sericeis sessilibus fasciculalis, fasciculis alternis ! 

 stipulis minutis spiuescentibus ; floribus 1 - 3 ex codem fasciculo foliorum breviter pedunculatis ; corolla 

 flava. 



S. Greggii. — In a dry valley near San Lorenzo, in Northern Mexico, Dr. Gregg. — This is certainly 

 a Zygophyllaceous plant, notwithstanding the obscurely perigynous petals and stamens, and the alternate 

 simple leaves. 



