ROSACE AE. 203 



convolute as in no. 7; ovary covered with soft bristles interspersed with short 

 gland-tipped hairs. 



Dry exposed slopes of hills in the San Francisco Bay region. Distinguished 

 from the next by the soft non-glandular bristles of the ovary. 



7. R menziesii Pursh. Canon Gooseberry. Tall openly branched shrub, 

 4 to 8 ft. high; stems with mostly 3 strong spines at the nodes and also more 

 or less prickly, especially on the sterile shoots ; pedicels 1 or 2-flowered, the 

 bractlet rather near the flower; flowers % in. long; exterior of calyx more or 

 less glandular-pubescent, its lobes lurid-purple, 3 lines long, closely reflexed : 

 petals white, waxy, involute from each edge, truncate and often minutely 

 crenulate-toothed at apex, 2 lines long, the stamens nearly twice as long ; 

 style exceeding the stamens, 2-cleft at apex; ovary covered with short hairs, 

 the hairs capitate-glandular. 



Canons and brushy slopes in the outer Coast Eanges of middle California. 

 Jan. -Feb. 



K. speciosum Pursh. Tall thorny nearly evergreen shrub ; leaves dark green, 

 small, coriaceous; flowers 5 or 4-merous, bright red, drooping; corolla 6 to 8 

 lines long, the stamens % to 1 in. long, long-exserted; calyx-lobes erect. — 

 Monterey to San Diego. 



ROSACEAE Rose Family. 



Herbs, shrubs or trees. Leaves alternate, toothed or divided, ours with 

 stipules, commonly petioled. Flowers regular, commonly perfect, solitary or 

 in spikes, racemes, corymbs, panicles or cymes. Calyx 5 (or 4)-lobed. Petals 

 5, rarely none. Stamens 10 to numerous, usually indefinite, inserted with the 

 petals on the calyx below its lobes. Pistils 1 to many, distinct and free from 

 the calyx, or united into a 2 to 5-celled ovary which is nearly or completely 

 inferior. Fruit a follicle, an achene, a drupe, a cluster of drupelets (as in a 

 blackberry), or a pome. Seeds with straight embryo; endosperm usually none. 

 Calyx in certain genera appearing double by a row of braetlets borne at or 

 near the sinuses. 



A. Ovary superior. 



1. Fruit dehiscent, consisting of 2 to 5 follicles; shrubs with simple leai'es.—SpiKEAE 



(Meadow Sweet Tribe.) 

 Follicles dehiscent by both sutures, several-seeded; flowers in corymbs... 1. Physocarpus. 



Follicles dehiscent by the dorsal suture or indehiscent, 1-seeded; flowers in panicles 



2. Holodiscus. 



2. Fruit indehiscent, consisting of i to many achenes or composed of drupelets and styled 



a "berry."- — Roseae (Rose Tribe). 

 a. Shrubs. 

 Leaves simple; pistil 1, becoming an achene. 



Petals white; leaves linear and rigid; achene not tailed 3. Adf.nostoma. 



Petals none; leaves broadly obovate; achene with long plumose tail. .4. Cercocarpus. 



Leaves pinnately compound; pistils many, disposed on the inside of a globose or urn-shaped 



calyx-tube which is lined by the receptacle and in fruit termed a "hip;" stems prickly. . 



5. Rosa. 



Leaves simple or compound; pistils many on a convex receptacle, becoming drupelets 



which are coherent and form the fruit called a "berry" 6. Rlbus. 



b. Herbs. 

 Perennials. 



Pistils many on a convex receptacle, becoming achenes; calyx with a row of braetlets 

 alternating with the sepals. 



Receptacle fleshy; leaves 3-foliolate 7. Fragaria. 



Receptacle dry; leaves digitate or pinnate 8. Potentilla. 



Pistil 1; leaves pinnate. 



Petals yellow; prickles of calyx hooked at tip 9. Agrimonia. 



Petals none; prickles of calyx straight, but retrorsely barbed 10. Acaena. 



