122 SAXIFEAGE.E, 



-i— -i— Calyx campanulate, only the base adherent. 



3. T. heterophylla (T. & G.), Hook. & Arn. Slender, 1 ft. high, 

 scabrous-hirsute: lowest leaves %. — 1 in. broad, with 5 shallow rounded 

 lobes : cauline more deeply 3-lobed or -parted: pedicels very short, the 

 broad truncate-based calyx appearing almost sessile -.petals (at least the 

 lower 3) obtusely 3-lobed: styles glabrous: seeds muriculate. — Common in 

 the Coast Range. 



4. T. Bolauderi (Gray), Boland. Near the last but larger, often 2 ft. 

 high, more hirsute: radical leaves 1}4 — %% in- broad; cauline more 

 divided; petals 3—4 lines long, obovate or oval, the upper entire, the lower 

 often with a lateral tooth on each side: seeds muricate-scabrous. — South- 

 ern slope of Mt. Diablo, Brewer. 



4. TIARELLA, Linn. Perennial herbs with simple or 3-foliate 

 alternate more or less distinctly stipulate leaves, and a terminal panicle 

 or raceme of small white flowers. Calyx 5-parted, the lobes valvate. 

 Petals 5, entire, unguiculate. Stamens 10, inserted with the petals into 

 the base of the calyx; antlers with 2 parallel cells. Ovary 1-celled, 

 compressed, the two valves early separating and becoming unequal, one 

 becoming lanceolate-elongated, the other remaining short. Seeds few 

 at the base of each placenta. 



1. T. nnifoliata, Hook. Pubescent, 6 — 15 in. high; leaves thin, ovate- 

 cordate, rounded or triangular, 3 — 5-lobed, the lobes crenate-toothed, 

 the radical ones long-petioled, the cauline few, small, short-petioled : pani- 

 cle narrow and raceme-like : petals almost filiform. — From San Mateo Co., 

 Kellogg, northward, in woods. 



5. HEUCHERA, Linn. (Alum-boot). Perennial herbs, with leaves 

 and flowering stems from a short branching caudex, the former long- 

 petioled, palmately veined, roundish cordate, slightly lobed. Stems 

 somewhat scapiform, bearing few alternate reduced leaves and a panicle 

 or thyrse of cymose-dichotomous clusters of small white flowers. Calyx 

 campanulate, 5-lobed, the tube adherent to the ovary below; lobes 

 obtuse, imbricate in bud. Petals 5, small, entire. Stamens 5, alternate 

 with the petals; anthers 2-celled. Capsule 1-celled, with 2 parietal 

 placentae, 2-beaked, dehiscent between the beaks. Seeds horizontal, 

 oval, muriculate or hispidulous. 



1. H. micrantha, Dougl. Leaves thin, 1—3 in. broad, ovate-cordate, 

 5— 9-lobed, hairy on the veins beneath: stem villous, bearing a few small 

 leaves and a loose panicle often 1J^ ft. long: calyx campanulate, 1 — 2 lines 

 long, acute at base, shorter than the slender pedicels, puberulent: 

 narrowly spatulate petals and slender filaments white, well exserted.— 

 Common in shady ravines. May— July. 



2. H. pilosissima, Fisch & Mey. Hirsute with rusty and viscid 

 spreading hairs: leaves 1 — 3 in. broad, round-cordate, obtusely lobed 



