2 I S RUTACEAE. 



1. C. palustris L. Water Fennel. Aquatic; stems 5 to 10 in. long; 

 submerged leaves narrowly linear, 1 -nerved, notched at the apex, 7 to 10 lines 

 Long; emersed or floating leaves obovate, narrowed at base into a slender 

 ]»eti,,lc, 2 to 6 lines long; fruit obovate, flattened, notched at apex, y 2 to 1 

 line long; each lobe sharply winged on the back for its whole length, the 

 proximate lobes with a groove between them. — (C. verna L. in part.) 



Cold pools or slow streamlets: Napa Valley; Marin Co.; Gilroy. Mar.- 

 Mav. 



2. C. marginata Torr. Stems 2 to 4 in. long, forming dense mats in the 

 moist beds of vernal pools from which the water has disappeared; leaves 

 oblanceolate, 2 or 3 lines long; plants sometimes submersed and the leaves 

 linear; bracts none; styles long, reflexed, soon deciduous; fruit rather less than 

 ' L . line long, broader than long, notched both at apex and base, the lobes 

 sharply winged; fruiting pedicels 2 to 5 lines long. 



Napa Valley southward to the San Joaquin Valley and Southern California. 



RUTACEAE. Rue Family. 



Herbaceous or arboreus plants, ours shrubs or small trees, with glandular- 

 dotted or aromatic leaves and no stipules. Flow r ers regular and symmetrical, 

 or nearly symmetrical. Sepals and petals 4 or 5. Stamens as many or twice 

 as many, inserted outside of a hypogynous disk encircling the base of the 

 ovary. 



1. PTELEA L. 



Leaves pinnately trifoliolate with sessile leaflets. Flowers small, greenish 

 white, in axillary paniculate cymes. Flowers polygamous. Sepals, petals and 

 stamens 4 or 5. Ovary with a short thick stipe, 2-celled; cells 2-ovuled, the 

 Lower ovule abortive; style short; stigmas 2. Fruit a 2-celled 2-seeded samara, 

 winged all around, broadly orbicular. (Greek name of the Elm, the fruit of 

 which is very similar.) 



1. P. baldwinii T. & G. var. crenulata Jepson. Hop Tree. Small tree 

 8 to 15 ft. high; glabrous or with a slight pubescence on the inflorescence and 

 under surface of the leaves; leaves elliptic, obovate or elongated-rhomboidal, 

 rounded or acute at apex, often with abruptly cuneate base, crenulate or almost 

 «nt ire, 1 to 2% in. long; buds downy; sepals very small; petals 2% lines long; 

 stamens hairy towards the base; fruit straw-yellow, 5 to 6 lines long, a trifle 

 broader, tipped by the persistent style. — (P. angustifolia of Bot. Cal.) 



Coast Eanges: Lake Co.; Mt. Diablo. Sierra Nevada foothills. Apr.-May. 



ANACARDIACEAE. Sumach Family. 



Trees or shrubs with resinous or milky acrid juice and alternate leaves. 

 Blowers very small, regular, either perfect or polygamous. Calyx commonly 

 5 parted, a glandular ring or cup-like disk lining its base. Petals commonly 5, 

 the stamens as many or twice as many. Ovary free from the calyx and from 

 the disk, 1 -celled, L-ovuledj styles 3. Fruit a dry berry-like drupe; seed 

 without endosperm. 



1. RHUS L. Sumach. 



Leaves simple or (in ours) 3-foliolatc and deciduous. Stamens 5, inserted 

 under the edge "t' 'he disk. Drupe small, compressed, with thin llesh and bony 

 Btone. (Ancient name.) 



