HELIANTHEMUM 69 



leaves in spring. The fruit is a globular woody capsule with 2 to many- 

 seeds. [Seeds; twig cuttings.] 



KEY TO THE PITTOSPORUMS 



* Flowers white or nearly so. (A.) 



A. Flowers very fragrant at night, ^ inch long ; leaves a rich deep 

 green, lanceolate, often undulated at the margin ; seeds numerous 

 in the ^-inch pod. Wavy-leaved Pittosporum or Mock, 

 Orange (23) — Pittosporum undul^tum. 



A. Flowers slightly yellowish with narrow petals, February, March ; 

 leaves silky- white when young; seeds 4. Madras Pittosporum 

 — Pittosporum tetrasp^rmum. 



A. Flowers pure white and fragrant, i inch broad, in winter; 

 leaves broad towards tip and blunt, dark above, pale below 

 (sometimes variegated.) Common Pittosporum or Tobira 

 (24) — Pittosporum Tobira. 



* Flowers some shade of yellow. (B.) 



B. Plants clothed with rusty hairs ; leaves about 3 inches long and 

 half as wide ; flowers i inch long, yellow, February to April. 

 Pittosporum (25) — Pittosporum revolutum. 



B. Plants smooth throughout. (C.) 

 C. Small tree or large shrub with weeping twigs ; leaves 2-4 inches 



long with hooked point. Pittosporum phillyraeoides. 

 C. Shrub 6 feet high ; leaves broad towards tip ; flowers clustered, 



greenish yellow, jasmine-scented. Cape Pittosporum (26) — 



Pittosporum viridiflorum. 



* Flowers almost black and seeds black ; used in California as wind- 



breaks and hedges. (D.) 

 D. Leaves pale and glaucous below, 2-3 inches long and blunt at 

 ' tip; a pyramidal tall shrub or tree. Karo (27) — Pittosporum 



crassif51ium. 

 D. Leaves thin, dull green, 1^-2 inches long and pointed at tip ; 



tree-like. Tawiiiwhi — Pittosporum tenuif61ium. 



Helidnthemum. The Rockrose — Helianthemum Chamaecfstus — and 

 the Frostweed (28) — Helianthemum canad^nse — are beautiful rock- 

 work plants with usually bright yellow flowers an inch or more in diameter. 

 Some varieties have red or copper-colored blossoms and some are double. 

 The leaves are linear, hairy above and whitish beneath and generally 

 alternate except at base. " The plant commonly cultivated, Helianthe- 

 mum Chamsecistus, grows in procumbent mats less than a foot high and 

 the 5-petaled flowers are in nodding racemes v/ith hairy stems. Tlie 



