Question: Which plant has a bigger genera, Scilla or Petrophytum?
Context: Hyacinthoides non-scripta (formerly "Endymion non-scriptus" or "Scilla non-scripta") is a bulbous perennial plant, found in Atlantic areas from north-western Spain to the British Isles, and also frequently used as a garden plant.  It is known in English as the common bluebell or simply bluebell, a name which is used in Scotland to refer to the harebell, "Campanula rotundifolia".  In spring, "H. non-scripta" produces a nodding, one-sided inflorescence of 5–12 tubular, sweet-scented violet–blue flowers, with strongly recurved tepals, and 3–6 long, linear, basal leaves. Ledebouria socialis, the silver squill or wood hyacinth, is a geophytic species of bulbous perennial plant native to the Eastern Cape Province of South Africa.  It was first described by John Gilbert Baker as "Scilla socialis" in 1870.  John Peter Jessop later revised the genus "Scilla" and split off several species, reclassifying "Scilla socialis" into the genus "Ledebouria" in 1970.  It is often cultivated and grows well with minimal care. × "Chionoscilla" is the genus name used for hybrids between the two closely related genera "Chionodoxa" and "Scilla". Scilla ( ; Squill) is a genus of about 50 to 80 bulb-forming perennial herbs in the family Asparagaceae, subfamily Scilloideae, native to woodlands, subalpine meadows, and seashores throughout Europe, Africa and the Middle-East.  A few species are also naturalized in Australia, New Zealand and North America.  Their flowers are usually blue, but white, pink, and purple types are known; most flower in early spring, but a few are autumn-flowering. Hyoscyameae is an Old World tribe of the subfamily Solanoideae of the flowering plant family Solanaceae.  It comprises seven genera: "Anisodus", "Atropa", "Atropanthe", "Hyoscyamus", "Physochlaina", "Przewalskia" and "Scopolia".  All seven genera of the tribe are poisonous and have a long tradition of use as medicinal plants, being rich in tropane alkaloids with anticholinergic properties.  Furthermore, the genera "Atropa", "Hyoscyamus", "Scopolia" and "Physochlaina" have furnished entheogens - the first three in the historical context of European witchcraft and, more specifically, of the flying ointments employed in such practices, while the similar chemistry of the remaining genera points to the potential for entheogenic use.  Six of the genera have dry, pyxidial fruits i.e. capsules dehiscing by an operculum and thus resembling a pot with a lid.  The fruit of the remaining genus "Atropa" is a glossy, juicy berry, making "Atropa" species especially dangerous poisonous plants, since - unlike other Hyoscyameae - their attractive fruits may easily be mistaken for edible berries, particularly by children - as has frequently occurred in the case of "Atropa belladonna", the infamous Deadly Nightshade. Petrophytum cinerascens (orth.  var.  "Petrophyton cinerascens") is a rare species of flowering plant in the rose family known by the common names halfshrub rockmat and Chelan rockmat.  It is endemic to the state of Washington in the United States, where it occurs in just a few locations along the Columbia River in Chelan and Douglas Counties. Petrophytum (orth.  var.  Petrophyton) is a small genus of plants in the rose family known as the rock spiraeas or rockmats.  These are low mat-forming shrubs which send up erect stems bearing spike inflorescences of flowers.  The brushy flowers are white and have many stamens and hairy, thready pistils. Rockmats are native to western North America. Scilla hyacinthoides is a geophyte, native to the Middle East, though it was also brought to France by the Turks.  Currently this plant is in the process of domestication as a cut flower in Israel due to its inflorescences. Scilla verna, commonly known as spring squill, is a flowering plant native to Western Europe.  It belongs to the squill genus "Scilla".  Its star-like blue flowers are produced during the spring. Petrophytum caespitosum (orth.  var.  Petrophyton caespitosum) is a species of flowering plant in the rose family known by the common name mat rock spiraea.
Answer: Scilla